3 предложения с 1 - finish, 2 - finished, 3 - finished, и 3 предложения - 1 - с forget, 2 - forgot, 3 - forgotten.
I usually finish my homework at 8 pm. He finished his work at 9 pm. I have already finished my task. I usually forget my friend`s surname. My friend forgot his keys at home. I haven`t forgotten to write to her yet.