某些介词(短语)位于句首,且谓语动词为系动词引起全倒装

倒装句结构
一． 虚拟语气中的倒装：如果从句中有were, had, would, should 等词时，使用倒装，方法是，系动词全倒装，实易动词半倒装。
1. Were it not for your help, I wouldn’t have got what I have today.
2. Had I known it earlier, I wouldn’t have lent him the money.
3. Should he act like that again, he would be punished.

二． 当句首为 here, there, now, then 时，谓语动词为系动词时倒装，但人称代词做主语时不倒装。
1. Here is a book you want.
2. There goes the bell.
3. Now comes your turn.
4. Now is the hour when they say goodbye.
5. There he comes.
6. Here they are.

三． So can we, so he is.
1. They can leave now, so can we.
2. You have helped her, and so has she you.
3. he loves the girl, so does she him.
4. she respected me, so did I her.
5. you can’t do it, nor can I.
6. She didn’t see the film last night, neither did he.
7. He is a good student, so h