I have made a lot more mistakes than you have.
Americans eat more than twice as many vegetables per person today as they did in 1910.
十、使用状语从句时要注意的几个问题
1.在时间和条件状语从句中,主句是一般将来时,从句通常用一般现在时或现在完成时表示将来。
We'll go outing if it doesn't rain tomorrow.
Don't get off until the bus has stopped.
2.有些时间、地点、条件、方式或让步从句,如果从句的主语与主句的主语一致(或虽不一致,是it),从句的谓语又包含动词be,就可省略从句中的“主语+be”部分。
1)连接词+过去分词
Don't speak until spoken to.
Pressure can be increased when needed.
Unless repaired, the washing machine is no use.
2)连词+现在分词
Look out while crossing the street.
3) 连词+不定式
The wounded person opened his mouth as if to say something.
4)连词+形容词/其他
常见的有if necessary,if possible,when necessary,if any/so, though suspicious等。
Though cold, he still wore a shirt.
I have no money.If any, I will lend you some.
3.状语从句与非谓语动词的转换。
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