20. As he (past of speak), he (past progressive of shake) from head to foot.
21. The clouds (past of lie) low on the horizon.
22. The building in which I work (present perfect passive of burn).
23. Your employer (present perfect deal) fairly with you.
24. I (present perfect of have) the same position for three years.
25. I (future of lend) him no money.
26. The floor (past passive of lay) by an expert workman.
27. The beads (past passive of string) on a waxed thread.
28. He (present perfect of throw) the whole office into confusion.
29. Before he came forward, he (past of set) the child down.