1) the phone must rings because i am expecting David to ring.
2) Anna is better than Rula and she should probably win the race tomorrow.
3) A letter, which was arriving, could be from your cousin, Janice.
4) There is a knock at the door but it cant be Colin, like your mum says, because she is on holiday.
5) I see thet he wearing a costume, he must going to a fancy-dress party.
6) My sister is looking for her hairbrush, it might be in the living room.
7) I am waiting for Harried to arrive, she should be here in half an hour.
8) James is sad, he could have a trouble at school.