Answer:
Simple present: study/studies; prepare/prepares
Simple past: studied; prepared
Simple future: will study; will prepare
Present progressive: is/are studying; is/are preparing
Past progressive: was/were studying; was/were preparing
Future progressive: will be studying; will be preparing
Present perfect: has/have studied; has/have prepared
Past perfect: had studied; had prepared
Future perfect: will have studied; will have prepared
Present perfect progressive: has/have been studying; has/have been preparing
Past perfect progressive: had been studying; had been preparing
Future perfect progressive: will have been studying; will have been preparing
