昂秀英语口语王 cd2 - Track 14

I'm not sure about that. 我想不大可行吧。

I wouldn't say that. 我不赞同。

I'm not sure that the case. 我不确定是否是那样。

Why not? 为什么不?

It may not be that simple. 问题可能没那么简单。

I don't often use them. 我很少使用。

I wouldn't really know. 我不知道。

I'm not really sure. 我不确定。

I wouldn't know anything about that. 我不知道。

There is nothing wrong with it. 那个没有什么不好。