a) That was a long walk! You must be tired.
b) Sorry I was away yesterday. I had to go to the hospital.
c) Will you be able to give me some help tomorrow?
d) Do you have to go now?
e) Peter could ride a bike when he was seven.
f) Mary must be in her bedroom. The light is on.
g) Students should not leave their bicycles near this door. It is forbidden.
h) We had to try very hard, but we succeeded in the end.
