不定式当主词时it is +表语 to do sth句型中真正主词to do sth 可以是to be

不定式当主词时it is +表语 to do sth句型中真正主词to do sth 可以是to be 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 不定式做主语It+be+形容词+for sb.to do sth 和 It+be+形容词+of sb.to do sth 英语句型中什么时候用do sth,to do sth,doing sth或 to doing sth It is fun to do sth.句型fun的词性 是it is time to do sth还是 it is the time to do sth it be adj to do sth与sth be adj to do区别 eg.It is easy to take It would be better to do sth. 是it is difficult to me to do sth it is/was adj.for sb to do sth.真正的主语是to do sth,sb是此句的宾语,又是to be important to sb.与It is important for sb.to do sth.与 sth.i It takes sb time to do sth 这个句型中 时间可以换成金钱吗