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英语翻译1.医生常说吸烟过多容易至癌Doctors often say that too much smoking is

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英语翻译
1.医生常说吸烟过多容易至癌
Doctors often say that too much smoking is likely to lead to cancer
为什么 Doctor要加S say什么不用其过去式said?
2.看见前面有红灯,司机不得不慢了下来
Seeing a red light ahead,the driver had to slow down
为什么用had?有过去?没啊,前面还用现在分词来着
3.你离开教室时,别忘了关灯
Don’t forget to turn off the lights when/before you leave the classroom
为什么不用leaving
1.医生在这里不止指一个,是泛指医生的话,而医生常说吸烟过多容易至癌是"真理"式的东西,而且这里有often,所以用一般现在时.
2.这句话省略了主语,完整的应该是:
The driver saw a red light ahead,the driver had to slow down .
因为不是被动关系,这里用现在分词引导.
3.forget to do something 忘记去做某事(将来的或没有去做的事)
forget doing something忘记做过某事(指的可能已经做过)