基本表达法

I’m not sure if it is.我拿不准。

I’m not at all sure if it is.我根本拿不准。

I’m not certain if it is.我拿不准。

I can’t say for certain.我说不准。

I’m not too sure of it.我不十分拿得准。中 华 考 试 网

I should think I heard some noise from above.我好像听到有人在上面出声。

I suppose it could be two o’clock at midnight.我猜那是在夜里2:00。

I think it was an American detective story or something like that.我想是一部美国侦探小说或类似(的书籍)。