i helped him find his father中的find为什么呢是原型

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• To find your way can be a problem中的to find为什么是主语啊?It would be nice to see him again.中的to see 为什么是主语呢?Now is the time.（现在是时候了）中Now为什么是主语?Carefully does it.中的主语是什么呢?
• Where is Jack?I can't find him anywhere.he___his homework upstairs.A must have done B must be doing我知道这里应该选择must be doing 理解为他正在楼上做作业.可是为什么不能选择must have done呢?这里不是问JACK在哪里吗?那应该表猜i测阿.must have done 不就是表猜测的嘛.如果不是的话,在哪种情况下用must have done 比较合适?
• so he is finding this trip very exciting为什么用现在进行时呢My brother has never been abroad before,so he is finding this trip very exciting.find 觉得的意思,为什么使用现在进行时呢,是新概念中的句子,大家联系上下文帮我分析一下好吗激动人心的旅行I have just received a letter from my brother,Tim.He is in Australia.He has been there for six months.Tim is an engineer.He is working for a big firm and he has already visited a great number of different places in Australia.He has just bought an Australian car and has
• I helped him find his father.为什么find不用过去式?
• the little boy was lost and i helped him（）his father.A finding B find C found D finds答案是b我觉的有helped再有find就两个动词了啊,请高人帮我分析一下4个答案选与不选的原因啊?
• i helped him find his father中的find为什么呢是原型
• cried on the road ,the little boy could not find his mother为什么用而‘cried"不是"crying""cried on the road "在句子中充当什么成分，哭对于小男孩是主动的，为什么不用ing形式呢
• 我感觉的英语强迫症了i was surprise to find my hometown changed so much分析一下句子中各词的成分这里是was作谓语呢,还是found作谓语呢,surprise to 是做什么成分呢,这里的to是介词还是不定式啊,我同学跟我说这是固定短语,可我总想弄明白,最近我们在讲不定式和介词,我总搞不清,look forward to 后面为什么加doing啊,这里的to是介词吗,可有些短语hope to do这里的to又是什么词啊,还是这是个固定短语啊?那一般在句子中做什么成分我感觉我的了强迫症,老想问为什么,我快钻进死胡同了,
• 几个高中语法知识~有耐心的高手来~1———I really don't like art ,I find his work impressive.A As B while为什么A不可以?不都同样是引导让步状语从句嘛?2No matter _____a full schedule you have ,only when you try really hard___alaways fit some more things in it.A how ,can you B what ,can you为什么不是A呢?无论你的计划是怎样的满~
• 英语中什么时候知道用的是非谓语?例如这句：But I was always busy,_____(able) to find any ​timefor conversation with him.为什么是填unable而不是其他形式?
• 英语连词成句 and lost him the nother boy was little his helped I find
• have a influence on sb 还是have a influence with sb