Take a deep breath. Calm yourself down before you start speaking, so that your lungs won't run out of air.
Distill your thoughts – do not spill them. Take the time to center yourself, and proceed mindfully from there.
Articulate your words. Pronounce each syllable individually. Syl-la-ble.
Take it very slowly, at first, until each sound is clear and distinct. Gradually speed up your speech and decrease the space between words until you are speaking normally.
1.Make sure you actually stop the air for consonants like 't' and 'b'. Differentiate between your vowels.
2.Don't expect to speak with perfect clarity right away. You may need to practice this for several hours each day.
3.Practice when you're alone – in the car, or walking down the street; when cleaning, or knitting.
Speak more slowly. It can be incredibly helpful to give your words an extra second or two to fully come out of your mouth. Pausing also works, because pausing allows the person you're speaking to, to digest all of the words you've just said.进一步放慢语速。开口说英语的时候稍微慢个1-2秒，让发音饱满完整，这会很有帮助。这1-2秒的时间，可以让听众有时间去理解你的意思。停顿也可以达到一样的效果。
2.Honing Speech Mechanics
Practice your grammar. If you use poor grammar, your thoughts and ideas may not come across as clearly as you'd like.
Expand your vocabulary. One apt word can be much clearer than a flurry of circumlocution. Try to find exactly the word you need – then use it effectively.
Think before you speak. If you prepare your words, you may run less risk of slipping up. Even if you don't plan out the exact words that you're going to say, you can take a moment to think through your ideas and clarify them in your mind.
Speak with inflection. Questions should ascend in pitch at the end. Statements should inflect somewhat deeper, with finality. Notice which syllables and words get emphasis. Try exaggerating your inflection, the way you would if you were reading a story to a small child.
Practice saying tongue twisters. If you work on phrases that are difficult to pronounce, you may find it easier to speak clearly in everyday conversation.
①betty and bob brought back blue balloons from the big bazaar.
②susan shines shoes and socks; she ceased shining shoes and socks for shoes and socks shock susan.
③sarah saw a shot-silk sash shop full of shot-silk sashes as the sunshine shone on the side of the shot-silk sash shop.
④chop shops stock chops.
Repeat the phrases over and over. Start very slowly and clearly, enunciating each syllable: "Five flipp-ant French-men fly from France for fash-ions." Get faster and faster while maintaining clarity.
反复练习。一开始练习的时候，速度可以慢些，但发音一定要清晰。例如：“Five flipp-ant French-men fly from France for fash-ions.” 刚开始说这句话的时候确保每个音节都到位，之后可以逐渐加快速度。
Be confident in your speech. Don't be afraid to speak loudly and clearly. Reciting anything that someone else has written—poems, books, tongue twisters—is great for practicing confidence.