9.how should I know?<粗>我怎么知道?
10.I should think so or I should hope so or I should imagine so
(expressing vague agreement)(用于表示没有把握的赞同)我想是的
I suppose that was the right thing to do.—I should imagine so.我觉得那样做是对的。——我想是的。
(expressing moral expectation)(用于表示对某事物基于道义上的预期推断)我想是的
I apologize for that.—I should think so too!我为这件事道歉。——我想你也会!