形式主语 it should be avoided to do sth.

形式主语 it should be avoided to do sth. be+adj+to do sth是不是都用it做形式主语? 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 主语+be+adj+to do sth 例句 请问形式主语It后面是否可以直接用“It is to do sth”? It's +形容词+(for sb.)+to do sth .什么为形式主语? it takes sb some time to do sth是形式主语吗 It is time for sb to do sth 存在形式主语吗? it is one's duty to do sth.其中______是形式主语,真正的主语是______. 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作形式主语的问题it's +adj+to do sth是否等于it's+adj+doing sth例如it's wr I should have avoided it?