fit（适合）， hold （容纳），join（参加）， mean （意味着）， belong to （属于）等不能用在被动语态中。

(3). 有些动词以主动形式表示被动含义。如：open, shut, sell, wash, write 等，其后常有副词修饰。

　　eg. The door won't open.

The goods sell both at home and abroad.

1. To review the differences of the conjunction: but/ however/although/while/whereas

I.辨析：whereas与 however

　　两者在语义上都表示转折，意为"然而"，"可是"，但用法略有差异。

A. whereas conj. used to compare or contrast two facts 然而，却，反之（引导与前句内容对立和对比的一个句子）

He is poor, whereas his brother is very rich.

=He is poor, while his brother is very rich.

Some people like fatty food, whereas others hate it.

B. However adv. used to introduce a statement 可是，不过（仅表语义上的转折，不含有对比性和对立性，而且在句中位置较灵活，一般用标点符号单独隔离出来。）

You haven't told us your opinion. You can, however, make it clear now.

Certainly, he apologized. However, I won't forgive him.

II opposite:

　A. prep. across 在...的对面

The store is opposite the station.

He stood opposite me, glaring at me.

B. adj. contrary 对面的；相反的；（立场、意见、性质等）相反的，相对立的

He stood on the opposite side of the street.

Her view and mine are completely opposite.

Light is opposite to shadow.

相关链接: opposite to 与 ......相对，相反 on the contrary 正相反，反之

III．knock down: 击倒；打倒

He was knocked down by a bike.

He knocked his opponent down three times in the first round.

IV. enough:

A. adj. 足够的；充分的。作形容词修饰名词时，可置于名词之前，也可置于名词之后。

eg. We have enough ice cream for children.

Do you have time enough to finish the work?

B. adv. 足够地；充分地（必须置于形容词和副词之后）

eg. Are you warm enough in such a light jacket?

Strangely enough, he can't recognize my voice.

C．pron. 足够；充分

eg. Enough has been said on this subject.

V. marry:

A. vt. 嫁；娶；把...嫁给，与...结婚；主持婚礼

eg. He married his boss's daughter.

I don't want to marry my daughter to you.

B. vi. 结婚