これらの本を書棚へ戻しなさい。

these

indicates possessive; nominalizes verbs and adjectives; substitutes for "ga" in subordinate phrases; (at sentence-end, falling tone) indicates a confident conclusion; (at sentence-end) indicates emotional emphasis; (at sentence-end, rising tone) indicates question

book; volume; script; this; present; main; head; real; regular; counter for long cylindrical things; counter for films, TV shows, etc.; counter for goals, home runs, etc.; counter for telephone calls

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

bookshelf

indicates direction or goal (e.g. "to")

to put back; to return; to give back; to restore (to a previous state, e.g. defrosting, reconstituting, reconciling); to turn back (e.g. clock hand); to vomit; to throw up; to recover (of a market price)

to do