1. 看到“together with”就选单数！
[真题] Professor Wang, together with his colleagues, ______working on the project day and night.
正式解释：谨记together with的主语是其前面的人，且几乎都考单数。类似常考词还有with，along with和as well as。
2. 看到“非谓语的主语”(常在句中逗号后)，主动就选to do或ing，被动就选过去分词！
[真题] ______from the outer space, the earth looks like a blue ball.
正式解释：此类题只需看逻辑主语（为方便可直接理解为题目主语）和动词的关系即可。题中逻辑主语the earth，与see是被动关系，所以用过去分词seen表被动；主动关系时，若表状态或进行用ing，若表目的或将来用to do；若有完成时就翻译成“已经……”，看是否合句意。
[真题] Only in this way______the plan successfully.
正式解释：否定词或only位于句首常引起倒装。倒装即把句子变为疑问语序，也就是先助动词再到主语。选项正常语序本是we can carry out，倒装后为can we carry out。
常考倒装否定词还有seldom, never, hardly, rarely, scarcely, little, few, not until, neither, nor, no sooner，看到这些词放句首，几乎就考倒装！
4. 看到“it is/was…”或“is/was it…”就选that或who！
[真题] It was in 1949______the People's Republic of China was founded.
正式解释：看到it is或it was开头立刻怀疑是否考强调。只要把it is/was…that/who…去掉，若剩下的仍然能成为一个正常句子即是考强调。一旦确定考强调，谨记强调的是人类就选who，强调的是非人类就选that，别无他选。不管强调的是时间、地点还是理由，只要是非人类都选that。
[真题] By the time I got home, my mother______to bed.
正式解释：看到by+时间，就考完成时。by+现在时间，选现在完成have done；by+过去时间，选过去完成had done；by+将来时间，选将来完成will have done。此外，看到so+far就选现在完成时。
[真题] ______, you would have seen your favorite movie star.
A. If you arrived earlier
B. If you had arrived earlier
C. Unless you arrived earlier
D. Unless you had arrived earlier
正式解释：看到if几乎就考虚拟，而且几乎都考过去虚拟。对过去虚拟，从句用had done，主句用would/should/could/might+have done。if引导的句子是从句，剩下的就是主句。能和if替换考的词有without, otherwise和but for。
[真题] Tim suggested that the meeting______till next week.
8. 看到“从句空格前有逗号”, 代替人就选who, 代替事或物就选which！
[真题] He takes a walk everyday,______is good for his health.
[真题] Could you tell us______?
B. what does your mother do
[真题] Our factory produced______bicycles in 2018 as the year before.
1. There are two major problems linked with atomic power plants,______the first concerns nuclear waste.
2. By the end of next year, I______enough money to buy a house.
3. She insisted that the seats______in advance.
4. Seldom______any mistakes during my past few years of working.
5. It was after he got what he had desired______he realized it was not so important.
11. With so much work on hand, you_____to see the game last night.
12. My car is broken. It requires_____.
13. There is not much news in today's paper, _____?
14. The more carefully you are, _____.
A. the less mistakes will you make
B. the mistakes will you make less
C. the mistakes you will make less
D. the less mistakes you will make
15. The nurses are trying their best to reduce the patient's fear_____he would die of the disease.
16. We took a taxi to the airport. Otherwise we_____late.
17. This town has_____bridge.
18. If it rains tomorrow, we_____to visit the museum.
19. I'm not_____to lift the heavy box.
20. When they entered the room, they found the windows open and something_____.