Read these sentences and fill in the gaps with 'could', 'can', 'couldn't', 'can't'.
1. Sally () talk to customers yesterday as she was a bit nervous.
2. I () never memorize all of the rules in the past, and I can do it now either.
3. Steve () solve this problem now. He needs time.
how many ways are there to do this?
what do people use?
do many people like music?
what do people listen to?
what do those who are fond of sports do?
there are a lot of fans among people,aren't there?
what helps us to visit different lands?
where can we see both sides of the Moon?
where can we spend time when we go out?
do newspapers or a radio tell us what is on at the cinemas and theatres?
where can you go if you are a theatre-goer?
who do villargers invite to their clubs?
who do pupils go to the cinema or theatre with?