He thinks it his duty to help the sick.我个人认为要加IS,可是好多人说可以不加，是不是真的可以不加呀？请问Aug_Ge加与不加在句子意思上有不同吗？

He thinks it must be his friend's house.是什么意思? He thinks it his duty to help the poor里面为什么用it? It's not easy to read his mindA learn from his thoughtsB make up his mindC get what he thinks What's his r___ for giving up Enghlish?Because he thinks it too hard. he thinks he has lost his gold watch. ---------he found it under the beda.luckilyb.suddenly c.recentlydclearly he _____smoking already because he thinks it is bad for his health.填give up的适当形式 【英语】句子填空!His life is a little busy___weekdays.After school,he often ___ with his friends,because he thinks it is good for his health. He thinks it's funny 过去式 he thinks it makes him relax He thinks it helps him a lot. Tom thinks it's his ideal room.啥意思 Mark thinks that it his duty to settle语法对吗 Q:He often does his homework at home{改成否定句} A:He doesn't often do his homework at home请高手验证对吗.还有：He likes dolphins, he thinks it's ont ugly( )foolish.A:and B:but c:orHe likes dolphins, he thinks it's not ugly( )foolish 英语 语法填空scientists are convinced _____ the positive effect of laughter.john thinks it won not be long______ he is ready for his new job. 一刀考试的英语题John thinks it won't be long ( )he's ready for his new job.A.when B.after C.before D.since为什么 Peter thinks Nanjing is his second _______ because he loves it very much. A. family B. room C. houC：home D：house My brother likes action movies.He thinks it's e( ) because he thinks it is very beautiful进行提问?