besides 引出的事物包括在我们所谈及的事情之内。She is very intelligent besides being very beautiful. 不过，当我们说 the only person besides 另外某人时，或 the only thing besides 另外某物时，我们指在某一特定场合或上下文中的唯一其他人或物。There was only one person besides me who knew where the money was hidden. 介词 except 后面通常跟我们的陈述中不包括的那些物、人、事的名词或代词形式。She spoke to everyone except me. except 也可作连词，引导从句或副词短语。There was nothing more to do now except wait. except 还可以引出由连词 that 、when 或 if 引导的从句。The house stayed empty, except when we came for the holidays. except for 是用在名词前的介词短语，用来引出某人或某物，说明要不是有某人或某物，所陈述的便为全部事实。Everyone was late except for Richard.

besides 引出的事物包括在我们所谈及的事情之内。She is very intelligent besides being very beautiful. 不过，当我们说 the only person besides 另外某人时，或 the only thing besides 另外某物时，我们指在某一特定场合或上下文中的唯一其他人或物。There was only one person besides me who knew where the money was hidden. 介词 except 后面通常跟我们的陈述中不包括的那些物、人、事的名词或代词形式。She spoke to everyone except me…I never take any drugs, except aspirin for colds. except 也可作连词，引导从句或副词短语。There was nothing more to do now except wait…Travelling was impossible except in the cool of the morning. except 还可以引出由连词 that 、when 或 if 引导的从句。The house stayed empty, except when we came for the holidays. except for 是用在名词前的介词短语，用来引出某人或某物，说明要不是有某人或某物，所陈述的便为全部事实。Everyone was late except for Richard. unless 是连词，后面的从句表示某事不会发生或不会成为事实。Unless you really want to lose weight, it will be hard to stick to a diet.