to do to be doing be doing 分别用于什么时态,在句中作什么成分

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• I'm glad to do that.这里的不定式to do that在句中作什么成分啊?是宾语还是状语?
• 最近高三老师复习非谓语,自己觉得思索以后好奇怪.英语省略句中省略主语和非谓语中过去分词作状语有什么联系,和to do ,doing有没有类似的联系? 是不是跟省略句中省略主语的原则有一些关系.具体是和哪个原则有联系呢 ?
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• I am afraid to climb the tree和he was afraid of falling .他担心掉下来.分别是什么句子结构.确切地说是想知道 to climb the tree或of falling 在句子中是作状语还是定语还是甚它……什么的?我要的回答不是be afraid to do和be afraid of doing 这种句型啊!
• Is this the best way you thought of ________ people from getting into the dangerous areas?A.to prevent B.preventing C.prevented D.having prevented为什么不可以是you thought作为插入语,而且the way of doing和the way to do的用法是可以通用的,改为陈述句也可以是i thought this is the best way of preventing people from...= this is the best way (i thought) of preventing people from...=this is the best way (i thought) to prevent people from...think是想到,think of 是再三考虑后的结果,在该句中因为没有上下文所以不予以比较.而且就百度百
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• be used to doing用于什么时态,如果用于过去时,为什么还是doing的形式?
• be used to 那be的时态可变吗?