I'm afraid I ______________ come to your party tonight.
can't
When Tom was 16, he ______________ run 100 metres in 11 seconds.
could
Tom ______________ walk when he was less than one-year-old.
couldn't
If you try hard, you ______________ pass your examinations.
can
Some robots ______________ play musical instruments now.
can
John was an excellent tennis player. He ______________ beat anybody.
could
This telephone is terrible. I ______________ hear you at all.
can't
They were so busy that they ______________ write me a text message.
couldn't
My brother ______________ cook very well. He is a chef in a French restaurant.
can
We tried hard but we ______________ persuade them to come with us.
couldn't