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求英语大手解决困惑it is no doubtto do sthit is no doubtthat有这种用法吗 2.s

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求英语大手解决困惑
it is no doubtto do sth
it is no doubtthat
有这种用法吗 2.since和as的表原因的区别 它们两个必须放在句首吗
it is no doubtto do sth 无此用法.
第二句应为there is no doubtthat
since 和as 都可表原因.since多用于解释显而易见的原因,多解释为“既然”,比后者常用.放句中也可以.
I don not have to go since he did not ask me to.
I went to bed early,as I was tired to death.
再问: 句子有点问题啊?to怎么能放句尾呢
再答: 这是汉英的不同,汉语喜欢重复,但英文则避免。这里省略了to 后面的动词go 。