The expressions they use might whom they are speaking to or how well they know each other.

She is very _______ about this topic, so we’d better not discuss it in front of her.

___ they visited our school, they showed great interest in everything they saw

Can we get everything ready by the weekend?— It all depends on we can get Mr Green’s cooperation.

I’m a little bit nervous because I don’t know how tospeak in front of so many people.—_______.