a) Read the table
Affirmative Negative
I/you/he/etc. I/you/he/etc. can"t speak english
can speak English

Interrogative Short answers
Can II/you/he/etc. speak English? Yes, I/you/he/etc. can.
No, I/you/he/etc. can"t.

I can speak EnglishYou cant speak Enghe can speak englishCan i speak english?Can you speak english?