正：Many students have a hard time passing all the tests to get into college， for example， my friend in high school。

　　8。 前后不一致

　　所谓不一致，包括数的不一致、时态不一致及代词不一致、主谓不一致等。

　　误：When one have knowledge， he can do what he want to do。

　　（one是单数第三人称，因而本句的have应改为has ；同理，want应改为wants。本句是典型的主谓不一致。

　　正：When one has knowledge ， he can do what he wants to do。

　　9。 时态、人称和数的搭配错误

　　汉语动词无时态、人称和数的变化，而对英语来说，这些都至关重要。

　　误：When I get to the station the train leave。

　　正：When I got to the station the train had left。