锥形瓶可以直接加热吗?要加石棉马

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• if there had not been a hard layer of rock beneath the soil,they would have completed the job in a hours.这句话我有2处不懂.1.if there had not been这里的had是作“有”的意思吗 had not 是否定形式“没有”的意思?如果这样的那后面为什么要加been呢?直接if there had not a hard layer of rock beneath the soil这样不就可以了吗?2.they would have completed the job in a hours,这句话我没能理解,应该怎么划分呢?这里的have什么意思呢?是什么用法?
• It's time for me to go to school 可以 不加to吗以前读过It's time for class 之类的句型都是for后直接加动词不用加不定式to 可是It's time for me to go to school 为什么要加to呢 是不是这个句子错呢
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• the only long period of time during it the whole family could betogether once a year is the Spring Festival.at that time we missed our parents badly ,but didn't say so because grandma always told us that work hard was everyone's duty and we should concentrate on ours.1.为什么要把IT改成WHICH啊?2.always 前应该+was吧?副词可以直接用吗?比如my parents were always busy.这句话就有BE 3.work 为什么要+ING?4.AND后加THAT这是什么句式?感觉很怪!
• He bought a book for me.间接宾语放在直接宾语后面要加介词to或者for,请问这里可以把for换成to吗?
• 让他别关窗:tell him not to shut the window;1：否定句不都是 有be的话就是be+not 没有be就是 do not的吗?为什么这边这个不定式可以直接加not 2：tell 我记得好像是要动名词开头的 这边为什么不用呀?
• 锥形瓶可以加热吗无论是间接还是直接
• 实验室中的三角瓶和锥形瓶有什么区别啊?都可以加热吗?