—We want someone to design the new art museum for us?—          the young fellow have a try?

 –Are you available at 3 tomorrow afternoon? --Sorry, I ________ a meeting at that time.

---Look at the boy running on the playground. Is it David? ---It ______ be him. I saw him go to the teachers’ office just now.

— Bill, is the pink umbrella Anna’s?— No, it _____ be hers. Hers is purple. 

— Jack, take more clothes when going camping. It ______ be very cold in the mountains.— Thank you, Mum. I will.