语法上的倒装句是强制性的，包括下列 7 种：
Can you do it?
How old are you?
When did you know him?
Who is your English teacher?
What happened last night?
May God bless you.
Long live the king!
There are many cars on the road.
There is a security guard outside the bank.
How beautiful the flower is!
What a smart boy you are!
5. 连接词“so, neither, nor”的句子，如：
Mary can ride a bicycle; so can I.
He can't sing; neither can she.
Tom has never been late; nor have I.
Were I you, I would not do such a thing.
Should the machine break down again, send it back to us.
Had you worked harder, you would have passed.
7. “as, however”连接的让步副词分句，如：
Small as the pen is, it is a powerful weapon.
However busy you are, you should spend some time on it.
Never have I seen such a wicked man.
On no account must this employee be fired.
Not until he told me had I heard anything of it.
No sooner had I left than the rain came.
Up jumped the puppy.
In came John.
Down fell the rotten branches from the tree.
Out came a woman and her maid.