Period Three　Grammar & Writing

一、表示转折关系的并列连词

1.but

but是连词，意为"但是"，用来引出相反意见或不同情况，常用于口语中。如：

I'd asked everybody but only two people came.

每个人我都请了，却只来了两个人。

2.however

however然而，不过。它的语气比but弱，不直接引出相反的意见，可放于句首和句中，且通常用逗号与句子其他成分隔开。如：

You will be lucky if he lets you go without a ticket.However，this does not always happen.

如果他不给你开罚单就让你走，那是你运气好。不过，这种事不是常有的。

I'd like to go with you；however，my hands are full.

我很想和你一块儿去，可是我很忙。

3.while

while是连词，意为"却，然而"，表示对比或用于引出相反的情况。如：

You like playing tennis，while I like reading.

你爱打网球，而我爱看书。

即时跟踪1　用but，however或while填空

(1)I was going to write you a letter，but I lost your address.

(2)Schools in the north are well­equipped，while those in the south are poor.

(3)The plan，however，has proven impractical at all.

二、表示让步关系的从属连词

1.although与though

(1)这两个词意思相同，通常可以换用，但although语气较重，通常放在句首，并用于正式场合。如：

I'd quite like to go out，(al)though it is a bit rainy.