(b) You can buy a screwdriver at a hardware store
(c) I can meet you at Ted’s tomorrow afternoon.
Can expresses ability in the present or future
(d) I (can’t/cannot/can not) understand that sentence
The negative form of can may be written can’t, cannot, or can not
(e) Our son could walk when he was one year old.
The past form of can is could
(f) He couldn’t walk when he was six months old
The negative of could: couldn’t or could not
English Grammar On Android - Click Here
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