modals

My mother... play the guitar very well when she was young.

• could

• can

 She screamed a lot but nobody ... heard her voice.

• could

• can

She ... understand five languages

• could

• can

I… play tennis now. I have a terrible headache.

• could not

• can't

• couldn't

• can

I... go to the party last night. I was sick.

• cannot
  

• could not

• couldn't

I... read without my glasses.

• can't

• can

• could

You ... do your homework, said the teacher,

• should

• must

• could

"You... too much sugar", said my friend.

• should

• must not

• shouldn't´t

  
  

You ... eat or drink in the library.

• should not

• must not

You.. smoke in here. It is not allowed.

• should

• should not

• must not