нужно правильно употребить в past simple , present perfect , present perfect continues
1. where are you? I (to wait) you for an hour already
2 He (not built) the house yet
3. Kate (to wash) the floor for twenty minutes and she ( to clean) two rooms in her flat.
4 the children ( to play) football since three o'clock but they are not tined.
5. Where you (to meat ) Mary and Josh the day before yesterday.
6. we ( to have buy) this house yet