allow既可作及物动词又可作不及物动词(多用于及物动词)，1）allow sb. to do sb.允许某人去做某事，The doctor allowed him to smoke. 医生允许他吸烟.2）allow sb doing sth.允许某人做某事,可以表示当前可允许做的事或习惯性动作。根据上下文有时sb可以省略。如： Is not allow (anyone)smoking in this meeting room. 这间会议室里是不允许吸烟的.类似的词还有:advise,forbid, permit, encourage等,如:3) We advised him to have a good rest. 我们劝他好好休息.4) He advised going to Beijing for the holiday. 他建议到北京去度假.
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