英语语法问题,used to在句中充当什么成分句子“There used to be a tree here."USED TO充当什么成分?变反义疑问句时是按照THERE BE句型么?可以举例句说明么?

英语语法问题,used to在句中充当什么成分句子“There used to be a tree here.USED TO充当什么成分?变反义疑问句时是按照THERE BE句型么?可以举例句说明么? what she likes to eat is just this.请问大神们这句话所使用的英语语法、句型,与其单词在句中充当的成分 read在句中充当什么?he had the questious read to him,read在句中充当什么 英语语法问题：It seems going to rain,and hence I should take an umbrella.一句中的and可否省略?即：hence可否充当连词? 简单的英语语法：389 is the number of days in a year (365) added to the number of months twice (24).请问这里的twice在句中充当什么成份?修饰什么的? 连词在句中充当什么成分 as在句中充当的成分 He is going to watch TV 中的watch 在句中充当什么成分 括号中的内容在句中充当什么成分His dream is (to become a scientist) she is now different from what she used to be中what she used to be充当什么成 The way he did it was different from what we were used to 中what在宾语从句中充当什么成分?及意思 There is a house where I used to live live in a house 所以where在从句中充当状语 这样理解可以吗 she found a job to work in a hospital.to work in a hospital在句中充当什么成分 it is very useful to me的句子结构是怎样的?to me在句中充当什么成分, 括号中的内容在句中充当什么成分Amy came to our school (to give us a talk )yesterday 99:the person has a year to find another job.to find.在句中充当什么成份? 帮忙分析一下动词不定式在句中充当的成分1.Does this disability make it difficult for them to do some things?2.I had to stop and rest halfway up the stairs.3.I used to climb trees.4.Just accept them and give them encouragement to live 疑问代/副词加不定式的问题...（英语语法咋那么难...)例如What to do?What在这个句子中做主语、那么to do充当什么呢?what又作do的宾语..很乱啊还有（疑问副词+to+不及物动词）这个结构成立的、