Must can may should could had to

I ... work harder to get better results.

You ... use my mobile if you want

She ... speak French, only English

You ... take the bus, it's too far to have a walk

I ... go to the doctor's, I have skin infection

You ... send too many messages in order not to have thumb arthritis

We ... use his computer, we have got our own laptop

Last year I ... sing very well

She ... speak Italian some years ago

It started to rain and we ... return

My Granpa ... speak several languages

He was weak and everybody ... look after him

She is a great doctor. She ... cure me of bad breath

People ... eat unhealthy food.