有些英语问题1、I don't think you can move the box,xince even two of

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有些英语问题
1、I don't think you can move the box,xince even two of us can't move it.
此处since even以及since even前的逗号是什么意思
2、we can change water into a gas,too,but we can first beat it to its boiling-point.
we can中的can可以换成can't么,too前后的逗号有什么意思么,
3、if you had had the right tools,can you have repaired the engine?
can 可以换成couldn't么
4、if you worked hard,you succeed.
succeed后面是不是有一个in
6、when he went out he left the radio on so that his parents should think that he was still in his room怎么解释应该；此处on是作副词修饰前面的半句句子么

逗号是为了分隔主句和原因状语从句,since是原因状语从句的引导词,even two of us,甚至我们两个合起来（都搬不动）.
can和can't咋可能一样呢?too通常都以逗号和主句隔开,后面的逗号是因为有but引导的转折关系的分句存在.
译为：我们能够让水气化,但我们要先把它加热到沸点.（窃以为后面的can换成 need to比较make sense）
可以换成could,not可不是随便加的,反意疑问句不是随便用的.
没有啊,succeed不及物没错,加in的话后面要加宾语,这里不过是没有指明在那方面成功,没有问题.
限定词（DETERMINER〕是在名词词组中对名词中心词起特指（SPECIFIC REFERENCE〕、类指（GENERIC REFERENCE〕以及表示确定数量（DEFINITE QUANTITY〕和非确定数量（INDEFINITE QUANTITY〕等限定作用的词类.
他出去的时候让收音机一直开着,这样他父母就以为他还在房间里.
leave .on,or leave on,让.保持开着.

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