Present perfect
2. Children/to swim/for half an hour.
3. He/to speak/on the phone/for an hour now.
4. You/to wait/for a bus/for ten minutes only.
5. It/to snow/since last night.
1. Don't walk in here. I …(just/clean) the floor.
2. Jane is hungry. She …(not /eat) anything for six hours.
3. She is tired. She …(study) for four hours.
4. I don't want to see that film again. I …(see) it twice already.
5. He …(walk) all the morning.