4.Since coal contains fewer hydrogen atoms than oil,then hav

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4.Since coal contains fewer hydrogen atoms than oil,then have to add some extra hydrogen to the gas.
1.此处since引导原因状语从句?
2.请挑重要的简要地说下since的用法

1. 你的说法很对.
2. since所加的原因状语从句一般放在主句之首,表众所周知的原因,有时翻译成"由于/既然"更准确.
3. 此外since还可以做adv/prep/conj,较多出现完成时态.请看例句:
I've lived here since.自那以后我就一直住在这儿.
I've lived here since 1998. 自1998年以来我就一直住在这儿.
It is/ has been 8 years since I moved here.自从我搬到这儿来已经8年了.
8 years passed since I had worked there.自从我不在那儿工作以来已经8年过去了.

4.Since coal contains fewer hydrogen atoms than oil,then hav More than twenty days ___ passed since I came here .空格中应填hav since then &since when fewer than 与less than? less than 和 fewer than Burning gas ,oil and coal creates air pollution 问2个英文的化学式Hydrogen cyanide－contains C,H and Nphosphorous pent 英语翻译Each Capsule Contains:squalence Fish Oil Natural equiv.t Since then he played in more than twenty films.这句话哪错了 But then /Before then / Since then/ Until since then和so Since then it goodbye