主谓一致
1，以s结尾的一些词不容易判断单复数，我们就必须用surrounding context来决定。一般在未划线部分会有提示。一般可通过未划线部分的动词单复数、代词、同位语来判断。
2，当and连接的两个名词被认为是one unit时，the verb is singular。例如千行82题，owning and living in a freestanding house refers to one concept
3，a number of=numbers of+可数名词复数+动词复数
4，高级【倒装结构】大总结，迎合GMAT考点要求
一.完全倒装
1. 表语在句首要倒装
·介词短语/形容词短语+系动词+主语(主语与前面的动词主谓一致)
1) 介词短语在句首
Among the people was a man named Brown. 在这些人中有一个叫布朗的人。
On the top of the hill stands an old temple. 这山顶上有一座庙。
From the valley came a frightening sound with some cries.
North of the city lies/is a new airport.
2) 形容词短语放句首
Present at the meeting is our English teacher. (Present出席的，在场的)
Gone are the days when we had a good time at the mountain village. (Gone 离去的)
二.部分倒装
1. 一些表示频率的副词(如many a time, often等)位于句首时 ,句子部分倒装.
Often did we go for walks together.
Many a time have I told him about it.
2. 用于“no sooner…than…, hardly…when…和not until等结构中”
No sooner had he arrived than someone called him.他一到就有人给他打电话
3. 用于省略if的虚拟条件状语从句(把were, had, should放在主语前构成倒装)
Were I you ( = If I were you ), I would not accept his present.
Had you ( = If you had ) studied hard, you might have passed the exam this time.
4. 否定副词(never, not…, seldom, hardly, neither, nor, scarcely, rarely, no longer, barely, little)
Barely did he have time to catch the bus.
Never have I been to Beijing.
5. Only在句首强调状语Only when the meeting is over can we know the decision.
Only is placed with precision next to the group of words it actually limits