Answer:
{Past Form}
1. noticed
2. known
3. talked
4. realized
5. began
{Sentence}
1. He noticed that they had not come to the front entrance but to the back door.
2. You must have known what she meant.
3. He said he had talked to his mother. We've talked about it long enough.
4. You just have to realize that you can't always get what you want.
5. She began to like him right away.
{Explanation}
i hope it helps
