Americans usually don’t pronounce the T if it’s at the end of a word. This is called the stop T. But we don’t simply remove the T; we change the way the word is pronounced, and we can usually hear whether someone is saying can or can’t. Here is how to pronounce the stop T:
The sound that comes before the T gets cut short abruptly. The n in can’t is almost not even pronounced. The o sound in boat is very short. The vowel in flight is very short. It’s a tense, short sound. The loudness, or volume, of the sound needs to stay constant until the abrupt ending of the word. For some words it helps to stick your tongue against the roof of your mouth as if you’re going to say the T.