Can vs. Can't
The word can't is stressed. It has a long clear /æ/ vowel sound.
Example: I Cæn't GO.
The word can is unstressed. It has an obscure /ə/ vowel or no vowel sound.
Examples: I cən GO. (or) I cn GO.
To understand the difference between can and can't , English speakers rely on the stressed/unstressed vowel sound NOT the presence/absence of the /t/ sound.
Listen to the sentences below. Do you hear can or can't?
1. I ______
call you tomorrow.
2. I _____ understand the question.
3. She _____ meet with me today.
4. He _____ make an appointment tomorrow.
5. He _____ come to the party.
6. I _______ be there by ten.