Question

I think it's a good idea.回答为什么不能用I think so ?只能用I don't thin

Answer 1

这个完全是表达的意思不同

i think it is a good idea.我认为这个想法很好

I do not think it is a good idea 我认为这个想法不好

I think so 我这么认为

I do not think so 我不这么认为