不论是在英语四级还是英语六级的作文中，最重要的就是经典句型，那么经典句型从哪里来，就由小编为大家介绍几个表示原因、比较、批驳的经典句型。既然大家都考的是六级，不能再在作文中出现比如i think等等这种低端句型，这样一下就把你的作文水平拉到最低端。所以大家一定要把下面几个句型背熟了，以便能在考试中用到。

　　一、原因

　　1.A number of factors are accountable for this situation.

　　A number of factors might contribute to (lead to )(account for ) the phenomenon(problem).

　　2. The answer to this problem involves many factors.

　　3. The phenomenon mainly stems from the fact that...

　　4. The factors that contribute to this situation include...

　　5. The change in ...largely results from the fact that...

　　6. We may blame ...,but the real causes are...

　　7. Part of the explanations for it is that ...

　　8. One of the most common factors (causes ) is that ...

　　9. Another contributing factor (cause ) is ...

　　10. Perhaps the primary factor is that …

　　11. But the fundamental cause is that

　　二、比较

　　1.The advantage far outweigh the disadvantages.

　　2.The advantages of A are much greater than those of B.

　　3.A may be preferable to B, but A suffers from the disadvantages that...

　　4.It is reasonable to maintain that ...but it would be foolish to claim that...

　　5.For all the disadvantages, it has its compensating advantages.

　　6.Like anything else, it has its faults.

　　7.A and B has several points in common.

　　8.A bears some resemblances to B.

　　9.However, the same is not applicable to B.

　　10. A and B differ in several ways.

　　11. Evidently, it has both negative and positive effects.

　　12. People used to think ..., but things are different now.

　　13. The same is true of B.

　　14. Wondering as A is,it has its drawbacks.

　　15. It is true that A ... but the chief faults (obvious defects )are ...

　　三、批驳

　　1)It is true that ..., but one vital point is being left out.

　　2) There is a grain of truth in these statements, but they ignore a more important fact.

　　3) Some people say ..., but it does not hold water.

　　4) Many of us have been under the illusion that...

　　5) A close examination would reveal how ridiculous the statement is.

　　6) It makes no sense to argue for ...

　　7) Too much stress placed on ... may lead to ...

　　8) Such a statement mainly rests on the assumption that ...

　　9) Contrary to what is widely accepted, I maintain that ...