3.already,yet 两者均为已经之意,但already一般用于肯定句中,而yet一般用于否定句和疑问句中,如:The guests have already arrived.客人已经到了。Have the guests arrived yet?客人到了吗?The guests have not arrived yet.客人还没有到。不过,有时already也可用于疑问句中,但意义与yet不同,already用于疑问句中表示惊讶。试比较:
(1)Have you had lunch yet?
(2)Have you had your lunch already?
句(1)是询问信息,意为:你吃过午饭了吗?句(2)表示惊讶,意为你已经吃过午饭了?yet有时也用于肯定句中,但yet在肯定句中的意思与still相同,表示仍然、还,与already不同:Dont worry. There is yet/still time for you to prepare for the exam.不用担心,你仍然有时间去准备参加考试。The plans are yet to be approved. 计划尚待批准。或者表示(未来某一时间)迟早、早晚:He may surprise us all yet.他迟早会使我们大吃一惊的。The enemy may win yet if we relax our efforts.如果我们松劲,敌人还是迟早有可能获胜的。
4.also,either,too,as well四者意思相同,但在用法上有不同。Also比较正式,用于肯定句或疑问句:Her sister has also gone to town. 她妹妹(或姐姐)也上城里去了。Are you also a member of his association? 你也是这个协会的成员吗?either只用于否定句,常出现于句尾:It wont do them any good,but it wont do them any harm either. 这事于他们无补也无损。Too和as well较口语化,常可互换使用:The dog is hungry,and thirsty too/as well. 这条狗既饿又渴。区别在于too只能用于肯定句,且在句中位置灵活:We,too,are going away.我们也要离开。As well 一般只用于句末:I understood from her that you undertook other important work as well.我从她那里了解到你还干其他一些重要的活。
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