How to lose your foreign accent

How can I improve my French pronunciation and lose my pesky accent? To explain this question, we would need to understand that a foreign accent results from not fully adapting to another language's set of phonological and phonetic rules. To make matters worse, we have a tendency to use our first language's pronunciation rules while processing our second language, this is especially true for beginners.

French is often rated amongst the world's sexiest languages; yet, the same traits that make French prose so eloquent and beautiful are land mines for us language learners. French is laced with liaisons, silent letters, and a variety of sounds that do not exist in English. Let's not forget that when you think you've found a rule to explain something in French pronunciation then it is usually riddled with exceptions (for example when to pronounce the final consonant in a word).

Remove Extraneous Sounds
Before introducing a whole new set of sounds for you to learn, an easier approach would be to first omit certain sounds when speaking in French. We'll look at English sounds you need to stop uttering followed by nonessential French sounds people somehow keep pronouncing.

You'll never pronounce these sounds in French, so remove them from your French persona:
The English sound [æ] within the words fat or cat doesn't exist in French.
Likewise for the [ɪ] in hit or squirrel and the [ʌ] in the word cup.
Let's not forget the [ɜ] in first, the [ʊ] in foot, the [θ] in three and the [ð] in this.
We also have the [tʃ] in cheer, the [dʒ] in joy, the [ts] in cats and the [dz] in leads.

Even after tossing that enormous list at you, arguably the hardest sound people forgetnot to pronounce is the [h] sound (in English words, hero or apprehend). The French simply glaze over the h and pronounce the vowel sound after it, so every h should receive the silent treatment from now on.

The reason reviewing these sounds are important could be when we look at English-French cognates. Cognates (vrais-amis) are words that share similar orthography and meaning between languages, however they aren't necessarily pronounced the same. When you pronounce the French word impossible as IM-PAH-SEEBLUH [ɪmˈpɒsiblə] versus UM-PO-SEE-BL [ɛ̃pɔsibl] then you secretly tell every French person you have American or English accent. Don't lower your gaurd on French-English cognates like muscle, important, or direction; frenchify them!

Lastly, anglophones have a specific problem with the pronunciation of verbs and final letters. I know it's tempting to pronounce the -ENT at the end, but please refrain from doing so.
All of these words sound similar to the first one in the sequence:
dansais - dansait - dansaient (not dansay-ENT)
parle - parles - parlent (not parl-ENT)
danser - dansé
il - ils (not ILS) the only time you'll hear the /z/ sound is when there is a liaison. A liaison is when the final consonant of the first word attaches itself to the vowel starting the second word.
So Ils aiment sounds like [il  z‿aime] and not *[ilS  aimeNT].
elle - elles (not ELLES) the same reason as the il - ils explanation.
leur - leurs (not LEURS) the same reason as the il - ils explanation.

Learn the New Sounds

French has several sounds that do not exist in English. As a result, you'll need to train yourself to accommodate them within your French pronunciation.

1) The French /y/
Dessous versus Dessus? Roux versus Rue? Nous versus Nu(e)? Doux versus Du?
This is an example of a sound that we English speakers assume we're saying correctly however to a French person's ears, something is wrong. If you pronounced any of those word pairs in a similar manner then you've failed to identify the phoneme /y/ which is nonexistent in English and replaced it with /u/ which does exist in English (within words like new or tune). From the list of words above, the 2nd word denotes the /y/ sound (dessus, rue, nue and du respectively).

/y/ can be created by taking the /i/ sound in a French word such as vie or lit and rounding your lips while saying the vowel. If you do this correctly then vie should become vu as in j'ai vu and lit should become lu such as j'ai lu un bouquin. 

2) The French /ø/ and /œ/
Le versus Leur? Eux versus Heure? Veux versus Veulent?
Neither of these phonemes exist in English, uh-oh. If any of those sounded the same then you're not distinguishing between /ø/ (le, de, ne, eux, veux, feu, peux) and /œ/ (leur, heure, veulent, beurre).

The /ø/ sounds like a solid "euh" sound and when it's followed by a consonant and /œ/ is pronounced (slightly longer variation of euu).

3) French Nasality
In English, we have nasal vowels except they are constrained to a rule. If a vowel in English comes before a nasal consonant (n, m, or ing) then we nasalize the vowel. To see this phenomenon in action, say the following words out loud while pinching your nose shut: car, camp, pin, ping, talk, talking. Notice the vibrations in your nose? An example of this nasal problem would be the words bonne or jaune which are not nasalized by French speakers except we have a tendency to do so because our native language dictates it.

In French, nasal vowels are encoded into the language and are used to distinguish words (unlike in English). So if you take the French word beau [bo] and nasalize the eau("o" sound) then you get bon [bɔ̃] which is a completely different word with a different meaning.

4) The Distinction between /e/ versus /ɛ/
/e/ sounds like "ay" and is similar to the vowel within the English word day (without the diphthong, the slight "yuh" sound which ends the word). While /ɛ/ could be found in the English word pet. The /e/ is typically found in open syllables, which are syllables that end in a vowel (jouer). The /ɛ/ is found in closed syllables, which are those that end in a consonant (jouet).

/e/ indicates the future tense (je partirai)
/ɛ/ should signal the conditional tense (je partirais) although sometimes the distinction is by context.
/e/ correlates to the accent aigu (dansé, téléphone, répondre).
/ɛ/ corresponds to the accent grave (frère, j'achète).
You use /e/ when you say the following:
mes, tes, ses, des, les, ces
You use /ø/ for the pronunciation of:
me, te, se, de, le, ne, ce

5) Semi-Vowels
l'huile, yeux, or oui are all examples of words containing semi-vowels. The most difficult one for us to master is the /ɥ/ in huile, lui, and minuit.

Polish the Old Sounds
Unfortunately, even sounds that exist in English are pronounced slightly differently in the french language. A huge giveaway that you're an English speaker, arguably more so than the manner you dress or the weight around your gut, is the English R and L. Believe it or not there are three types of L's in English except you probably wouldn't have recognized them all!

[r] are, car, dark, right
[l] bible, old, bill, light, clear

The R and L sounds are known as liquids, these sounds are intermediates between consonants and vowels. In the french language, the "l" is not elongated as much, it's short and crisp. The tongue is in a different position between the two languages.

Some Other Factors to French Pronunciation and Foreign Accents
1) Have you ever noticed that French speakers sound almost like they're singing when they talk? French words meld and flow in a fluid pattern while English is more choppy and requires stress upon syllables to distinguish words. This is because the french language is a syllable-timed language, so it has a less complex syllable structure and a relative isochrony from one syllable to the next in running speech. English, on the other hand, is stress timed, so there's a rhythmic pattern that encodes both strong and weak syllables. In a nutshell, in English words we place stress on a lot more syllables than French speakers do in thier language.

2) Intonation in French is slightly different than English. 

3) French is marked by increase tenseness with the muscles around your mouth. When saying words like vie or riz, pull your mouth all the way apart and really emphasize that tension. This tenseness plays into another factor of French: French vowels are not diphthongs, they are clean vowels.

4) Also remember that French prefer open syllables when pronouncing words, so most syllables end in a vowel sound while English speakers prefers the opposite, most of our syllables terminate with a consonant sound, closed syllables. This explains why even though the word animation is spelt the same in French and English, it's pronounced completely differently!

In French: A NI MA SIÕ
In English: AN I MAY TION

So when you're breaking a really long French word up into pronoun cable syllables, more likely than not (76% of the time actually) the syllable will terminate with the vowel sound.

5) We English speakers can have difficulty knowing when to pronounce the final consonant in a word. As a general rule, words ending in r, l, c, q, and f are usually pronounced (example, coq, fil, vif). I'm currently working on a long article on when to pronounce the last letter in words.

6) Although pronunciation is very important to sounding more French, to the French ears there are other things which can flag you as a non-native speaker of French. Many factors ranging from syntax (the order in which we put out words) to lexical semantics (the words we choose to express ourselves) can play a role.
Although considered a dialect, if you take the case of Southerners from the U.S who say hi like "haai" (pronunciation) and use y'all to represent you guys in Standard English (word choice) then combined these factors all tell us English speakers where they're from. This all relates back to you speaking French in several ways: if you ultimately want to sound like a native and you produce all of the sounds correctly then maybe the problem is how you combine the sounds (liaisons, intonation), which words you choose to speak with, or the word order you use to express yourself.

How Can I Improve my Pronunciation in General?

The easiest way is to improve your pronunciation is to gain more exposure to French, allowing you to effortlessly store the correct pronunciations in your head. Listen to French music, French radio and watch French videos. Absorb the french language like a sponge. It's more fun (and rewarding) to listen and converse with others than it is to watch a zillion youtube videos on how to pronounce things (as I've provided above).

A more proactive way of bettering your pronunciation is to repeat phrases and words after a native says something, this is especially true if you're in a French classroom. Try to say it in exactly the same manner, even if it's under your breath. Although this may feel silly at first, if you can't shadow native pronunciation then clearly you're altering some aspect of pronunciation that you shouldn't be messing with. The only exception to that last statement would be if that the person has a very dense accent.

Lastly when you talk with others, always ask them to correct your pronunciation if possible! Learn from your mistakes... And about foreign accents, love 'em or hate 'em, unfortunately they're here to stay unless you try to fix them.