① I think it my duty to do sth.和 i think it IS my duty to do sth.之间有什么区别?②第二句是复合句吗?

① I think it my duty to do sth.和 i think it IS my duty to do sth.之间有什么区别?②第二句是复合句吗? I think it my duty to write to you and thank you.(改为复合句)I think it ____ my duty ____ ____ to you and thank you. I think it my duty to write to you and thank you.(改为复合句)I think that it ____ my duty ____ write to you and thank you. I think It's my duty ______ make meals for my childen.不可灌水 I think it’s my duty to live a low-carbon life. I think it my duty to write to you and thank you.翻译 I feel it my duty to help you with your English这句话里,I feel it my duty对吗?如果I feel it's my duty呢? i do not think it is my _ that the window has been broken.a.error b.mistake c.fault d.duty为什么a b 选项不行呢, I think it our duty to study.I think it completeI think it our duty to study.I think it complete a waste of money.为什么第一句是对的,第二句却是错的? I think it our duty to study.I think it completeI think it our duty to study.I think it complete waste of money.为什么第一句是对的,第二句却是错的呢? I think it's our duty to keep our environment clean and tidy. i don't think it's my __that the TV blew up.i just turned it on;that's all.A errors B mistake C faults D duty选B 为什么其他的不行 I think it is my worry too I think it m____ my blue jeans. 是I think it is wrong对还是I think it wrong对?I think it is my duty.看起来有两个动词,但读起来还是这句通顺.中文翻译都是”我觉得这是我的职责“所以不知道那个是对的. it's my duty ...It's my duty to lok after the children.可以换成以下这样的表达吗It's my duty that I must look after the children. I think __our duty to keep our evirionment clean an tidy.A.this B.that C .it D.it's I feel it my duty to help her……省略了that?