Modal verbs SHALL, SHOULD, OUGHT TO, CAN, COULD, WILL, WOULD

___ you post this letter for me, please?

You ___ use my dictionary if you want.

I ___ harder for the exam. It was very difficult and I didn't pass it.

- It's very hot in here! - ___ I open the window?

Could I use your cell phone, please? – Sorry, you ___ .

You ___ take a mobile phone into the exam. It's prohibited.

It's a great town. You ___ visit it some day.

- It's very dark. - ___ switch on the light?

It's way past my bedtime and I'm really tired. I ___ go to bed.

- Where ___ we go tonight? - We ___ go to the park.