i don't think ( ) possible to master a foreigtn language without much memory work.填it,但是为什么没有is呢 即为什么不是i don't think it is possible to master a foreigtn language without much memory work.
问题描述：
i don't think ( ) possible to master a foreigtn language without much memory work.
填it,但是为什么没有is呢 即为什么不是i don't think it is possible to master a foreigtn language without much memory work.
答
think已做谓语了所以不能有is
答
可以加is，那就是复合句，Think引导宾语从句。不加，则为单句it做形式宾语宾语
答
还是加is读起来像英语，(*^__^*)...嘻嘻
答
否定前置，it做形式主语，这是一种特殊用法，类似于“I find it important for me to have it
答
加is的句子就是think后面接宾语从句了（省略了that）,也对的
不加is,think后面是接宾语加上宾语补足语,it做形式宾语,后面的不定式才是真正的宾语.
答
句型：think/find + it + 形容词 +to do
比如：I find it difficult to learn English well.
I think it easy to finish the task.
这里：it 是形式宾语，代替to do