_____ he understand what I'm talking about?
Can
(+) My sister _____ play tennis now.
can
(-) I _____ walk when I was less than a year old.
could not
(Polite) _____ you tell me what time it is, please?
Could
(-) My grandma ________ walk without any help anymore.
cannot
(-) They ________ play the piano.
can't
How long have you ________ drive?
can
(-) When we were 10, we ______ swim that fast.
could not
