You shouldn't go there

You must not go there

You had better not go there

You don't have to go there

May I use the computer?

Should I use the computer?

Do I have to use the computer?

I could sing well when I was a child.

I can sing well when I was a child

I am able to sing well when I was a child.

I was able to play the guitar

I am able to play de guitar

I can play the guitar.

I can speak more than 3 languages

I could speak more than 3 languages

I was able to speak more than 3 languages

I usually have to work on Sundays

I usually had better work on Sundays

I usually should work on Sundays

You should practice more

You have to practice more

You must practice more

You shouldn't walk there

You had better not walk alone there

You must not walk alone there

She is able to work while learning English

She was able to work while learning English

She could work while learning English