"carefully"是一个副词,主要用来修饰动词或整个句子,表示做某事时要小心或仔细。
后接介词 of 或 about,表示“当心”“留意”等。如:Be careful of the dog; it sometimes bites people. 当心那条狗,它有时候咬人。You must be careful of [about] your pronunciation. 你要注意你的发音。
表示做某事时要小心或仔细,其后通常接 in doing sth。如:Be careful in crossing the street. 过马路时小心。You cannot be too careful in driving a car. 开车时再怎么小心也不为过。
后接不定式,表示注意要做某事。如:Be careful not to drop it. 小心不要把它掉了。You must be careful to avoid being caught. 你必须小心,不要被抓住。
其后可接从句作宾语。如:Be careful how you hold it. 小心拿好。Do be careful (about) what you say. 说话一定要小心。