10月16日GMAT语法机经.

　　转眼10月已经过去了一大半，也迎来了每个月GMAT机经换库的日子，10月GMAT机经换库了，现在就由小编来为大家整理十月份的GMAT语法机经整理，下面是关于GMAT语法机经的相关问题，希望对大家有所帮助。

　　10.语法：有一个考倒装的

　　Were they to......they would have to

　　目测是前面应该是If they had....

　　选项里有Had they和If they had

　　虚拟语气(摘自PREP08)

　　1. 虚拟语气：

　　虚拟条件句的四种形式：

　　But for N, S + should/would/cold/might + V / (have Vpp.) 若不是N, S应该….

　　= If it were not / (had not been) for N

　　= Were it not for N / (Had it not been for N)

　　= Without N(介词只有without可表虚拟语气)

　　2. 虚拟语气的时态：

　　时间 从句谓语形式 主句谓语形式

　　将来 动词过去式(be用were)

　　should + 动词原形

　　were to + 动词原形

　　would / should / might / could + 动词原形

　　现在 动词过去式(be 用 were) would / should / might / could + 动词原形

　　过去 had +动词过去分词 would / should / might / could have + 动词过去分词

　　11.有either for or for

　　同第6题

　　12. Both and 但是要注意前后意思不同 但是格式相同 both the A of and the B of

　　同第7题

　　13.Though反正意思是不被认可，P，很多他的角色(什么家，什么家，什么家)写了一些works,一定要选works,因为后面的从句是their(指的是work，根据内容判断的)

　　考点：Pronoun agreement

　　14.还有一题选项里有

　　A.because...

　　B.due to...

　　C due to...

　　D since...

　　E because BY1429195287

　　15.只记得几个知识点了，纠结了很久：

　　一个物种还是自然现象，xx is only the tenth xx (某noun) known to be originated from xx and the first to be known to (某动词-ed).

　　底下的变体有：

　　known to have originated.

　　Known to has originated.

　　known that originated.

　　根据OG，” have found evidence to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved as a kind of snorkel. ” 我倾向于一般现在时be originated，但很不确定。BY braveyz

　　分析：(感谢Rinkabokka和Will)

　　**狗主给出的known to be originated应该是不对的，originate不应该用被动语态

　　**至于OG这题(题目见下面)为什么用了is descended from呢，解释如下：

　　*Descend的意思是“下降”，而没有“起源”的意思，表示起源，用的是descended(形

　　容词)，表示“起源于...的”

　　*表示”起源于....”，固定搭配：be descended from

　　延申一：

　　题目：Australian embryologists have found evidence that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolved as a kind of snorkel.

　　A. that suggests that the elephant is descended from an aquatic animal, and its trunk originally evolved

　　B. that has suggested the elephant descended from an aquatic animal, its trunk originally evolving

　　C. suggesting that the elephant had descended from an aquatic animal with its trunk originally evolving

　　D. to suggest that the elephant has descended from an aquatic animal and its trunk originally evolved

　　E. to suggest that the elephant is descended from an aquatic animal and that its trunk originally evolved

　　OA：E

　　RON关于这里descend用现在时的解释

　　"is descended from" is indeed a description of a condition in the present. it&aposs the same thing as "is a descendant of".

　　cf. my friend is a direct descendant of George Washington.

　　you wouldn&apost say "was", unless my friend is dead.

　　same thing with the elephant - if you write "the elephant was..." in this case, you are actually implying that the elephant is extinct.

　　延伸二 be known to have done sth的问题(摘自PREP08)

　　be known to have done sth的问题：当be known 和 do sth的发生的时间一致时，用be known to do sth;而do sth发生在be known之前时，则要用be known to have done sth。

　　1. 大全748：...few people are known to have recovered from the disease once the clinical symptoms have appeared.

　　2. 大全849：...few people have been known to taste it for the first time without requesting more.

　　3. og49：......satellites now known to orbit the distant planet.

　　*：事实上在看这两个结构时，可以把be known to这个类似助动词的成分去掉;由于跟在be known to后面的动词要用原型，所以去掉be known to以后就可以单纯地比较have done和do，have done所表示的发生时间比do所表示的发生时间要早，如果事件发生在过去就用have done，发生在现在就用do。同时如果be known to do/have done sth后面接状语那么修饰的是do/have done，而不是known.

　　以上就是关于GMAT机经的全部内容，考生朋友可以有选择的看看，最后需要提醒各位的是，GMAT机经虽然会对我们解题有所帮助，但是在考场中即使题目很像也要避免秒选，最后祝大家都能考出好成绩。