I think it was great为什么这里的think不变过去式?

I think it was great为什么这里的think不变过去式? 翻译It was a really nice surprise to get your emali I think it is a great id It was great and I think I learned a lot.和It was great and I think I have learned a lot.强调的各是什么 有什么区别 I think the school trip( ) great填was还是is I think yesterday's party was a great _____(succeed). I,it,great,don't,is,think 连词成句 I think it's great fun to () them. I think it is a great fun.改错) My friends and I had a great ___（经历）last week.I think it was ____（极好的）.My friends and I had a great ___（经历）last week.I think it was ____（极好的）.Then we ____（爬）to the top of it.We could see the ____（绝妙的 为什么用to tell you the truth而不用telling you the truth说出答案并说明理由！1.He made a great invention again,_______of great help to our daily life.a.which i think b.l think which is c.i think it d.which i think is2.was it on I think a great many people enjoyed it very much.中的a great怎么理解? It was great.I __________ been there many times. But I don't （ ）it's great.I think it's quite （）. What do you think of your new book Harry?oh,it's great .I wanted it to be published but I wasn't sure whether it ___successful.A has been B was C is D would be 口语交际1.What did you think of the film?A.It was all right.B.That’s a good idea.C.It was re1.What did you think of the film?A.It was all right.B.That’s a good idea.C.It was really great.2.A:Let’s watch a film tonight.B:I at home.A.would ra 48.5he made another discovery,___of great importance to sciencea.which i think isb.which i think it isc.which i think itd.i think is I don't think it's great .I_fact,it's boring .根据首字母补全单词 The story sounded interesting,but I think it was t_____