作业帮希望明白人为我详解 1,It is safe to say that eventually,as techniques and mass production come in atomic engines,____.为什么是the price will go down,而不是the price will be going down.不是表示未来价格下降的这个趋势（或
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希望明白人为我详解 1,It is safe to say that eventually,as techniques and mass production come in atomic engines,____.为什么是the price will go down,而不是the price will be going down.不是表示未来价格下降的这个趋势（或
希望明白人为我详解
1,It is safe to say that eventually,as techniques and mass production come in atomic engines,____.为什么是the price will go down,而不是the price will be going down.不是表示未来价格下降的这个趋势（或者说是状态）吗?2.AIDS is said ________ the number-one killer of both men and women over the past few years in that poverty-stricken region where no medical services are available．为什么being不对,不可以表示逐渐成为头号杀手吗?to have been3.He ___ unwisely ,but he was at least trying to do something helpful 为什么不能用must have acted?答案是may have acted4.The fragrance of many natural substances come from oils,____these oils may be used in manufacturing perfumes.为什么是and,不是from?5.To get up early and to go to sleep early_____good for your health.为什么是is?不是这两件事都对身体有好处吗?
希望明白人为我详解 1,It is safe to say that eventually,as techniques and mass production come in atomic engines,____.为什么是the price will go down,而不是the price will be going down.不是表示未来价格下降的这个趋势（或
一般将来时表示将来某个时间要发生的动作或出现的状态,将来进行时表示将来某个时刻正在进行的动作.这句话是对将来可能出现的情况预见,所以用一般将来时好.
It is said that sth / sb ...句型经常可以转化为另一种形式,即：sth / sb is said to do...,to do 与said 同时进行；sth / sb is said to have done .done 表示的动作早于said而且强调其影响.所以这一结构中根本没有没有ing形式.
must have done 表示肯定确信的推测,意思为一定已经……；may have done 表示不确定的推测,意思是可能已经…….
如果使用from句子就没有主语了,因此而成了病句.
早起早睡是一件事情的两个方面,同时具备才有益健康,试想如果只早睡不早起或只早起不早睡能有益健康吗?