she think it her duty to help us可以改为she think it is her duty

she think it her duty to help us可以改为she think it is her duty She feels it her duty ______(help) others . She think that it is great____ her to help people solve we think it our duty to help others为什么不加IS啊 ① I think it my duty to do sth.和 i think it IS my duty to do we think it our duty to help the people in trouble I feel it my duty to help her……省略了that? I think it my duty to write to you and thank you.(改为复合句) We think that it is our duty.（改为强调句） I think it our duty to study.I think it complete I don't think her passport's gone,______ A.is it B.has she C I think it is useful for us to help other people.改为一般疑问句