來(lái)源:網(wǎng)絡(luò )資源 2009-05-07 10:21:18
Review of units 1-3
重點(diǎn)詞匯
1. as
as作為連詞,引導時(shí)間狀語(yǔ)從句,"當……的時(shí)候",一般用于一般過(guò)去時(shí)。
例如:
As he explored the sea,he took a lot of pictures.
他在探海時(shí),拍了許多照片。
還可以引導原因狀語(yǔ)從句,只說(shuō)明一般的因果關(guān)系,語(yǔ)氣比because弱,說(shuō)明比較明顯的原因,它引導的從句通常放在句首,有時(shí)也放在句尾。
例如:
As the car is expensive,we can't buy it.
由于汽車(chē)太貴,我們買(mǎi)不起。
As everybody has come,we can set off.
既然大家都到了,我們可以動(dòng)身了。
as soon as 一……就
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