Grammar: use of can,coul, and will be able to

My parents are from Brazil, so I can / cannot speak Portuguese.

• can

• cannot

Could you speak English when you were three years old?

• Can you

• Could you

Don't worry if you don't understand. You can / could gesture.

• You can

• You could

I'm sorry, I didn't respond to you - I can't / I couldn't hear you.

• I can't

• I couldn't

Can you / Will you help me send these letters tomorrow?

• Can you

• Will you

My dad can't / couldn't take us tonight, so let's take the train.

• can't

• couldn't

Carlos has hurt his arm, so he cannot / will not be able to greet us tonight.

• cannot

• will not be able to

Elena lost her voice, so she didn't speak. At least, she can / could smile.

• can

• could

Our new teacher speaks very quickly, so we cannot / will not be able to understand him.

• cannot

• will not be able to

My appointment has been canceled, so we can / we will be able to have lunch tomorrow.

• we can

• we will be able to