I think it good manners to say hello to your teachers whenever you meet them.这句话中manner为什么用复数形式?

I think it's good for me还是I think it's good to me 为什么? i think it's good for them对吗them so I think it is not a good i think it is ( )good idea 添什么 I think it will be a good idea for us i think it 's good to study.怎么译 I think you must ( ) very good in it What i think it means to be a good person. i don not think it taste good 怎么回答 I think it is a good way for recreation. I don't think it's good 和 I think it isn't good 意思一样吗? 改错i think this is a good book.i don't think iti think this is a good book.i don't think it有什么错?改错 I think it is good for me.I think it necessary to…… it后什么时候有is I think it's a good idea to go fishing in such good weather(改否定) SOMETIMES I THINK IT IS GOOD TO SPEAK OUT MY SECRET,BECAUSE I THINK IT IS NE i don`t think it any good to.为什么it 后不加is i like cooking. i think it is a good way to______(使...放松) myself I like w___ to school because I think it is good for my health.非常急