形式主语it 难题Do you think it difficult to work out this question?在这句话中,it 后面为什么不用is

形式主语it 难题Do you think it difficult to work out this question?在这句话中,it 后面为什么不用is 形式主语 it should be avoided to do sth. 用it作形式主语改写1、you are so kind to tell me the truth.2、you are so foolish to do such things. it is adj to do句子成分分析to do为真正主语.it为形式主语.也就是说一个句子两个主语么?.那for sb呢? 请问It is only for you 中it 是形式主语吗?only for you It is diffcult for us to do it It是形式主语 is diffcult是谓语 for 是介词 to do it是真正主语吗 It is adj to do句子成分分析,为什么 to do 是真正的主语,为什么不是做原因状语,to do修饰adj 例如：一、It is necessary for you to learn English.it 做形式主语 不定式做“真正的主语“二、To learn English is n it做形式主语造句 It's +形容词+(for sb.)+to do sth .什么为形式主语?在这个句子中,什么为形式主语,真正的主语为后面的（ 有关it的用法It doesnt matter what they do.在这里是不是it做形式主语,what they do.做逻辑主语? it is very kind of you to help me ,it是形式主语吗? It做形式主语时其后 to do 和 ing 的不同用法 及具体例句 be+adj+to do sth是不是都用it做形式主语?动词不定式做宾补吗? It is +adj+ to do sth中It是形式主语吗?真正的主语是动词不定式to do st It is diffcult for him to do it it是不是形式主语 is diffcult是不是谓语 for him是不是状语 It’s glad to see you again句子成分分析it是形式主语吗 ,有形式主语这个成分吗,好久没碰英语了 都忘了, please (make)the plan before you do it正确形式 用it做形式主语改写You are so kind to tell me the truth.