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The medicine tastes bitter.为什么不用被动语态?

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The medicine tastes bitter.为什么不用被动语态?
The medicine tastes bitter.为什么不用被动语态?
taste在本句中是系动词,尝起来的意思,所以不用被动语态.这句话的意思是:这种药尝起来很苦.
再问: 系动词包括什么?系动词都不用被动?
再答: 连系动词含有一定意义,它们要与其后做表语的形容词,名词或介词(短语)一起构成合成谓语.系动词按意义可分为三类,而且有自己的特定用法. 一,按意义连系动词可分为以下几类: 1.表示状态的连系动词有: be ; appear ; seem ; keep ; remain ; continue ; stay ; prove 等 e.g a . She appears very young . b. His temperature seems to be all right . c. He made a fire in the room to keep warm . d. The weather continued fine . e. This proved very helpful . 2.表示感觉的连系动词有: look ; feel ; smell ; sound ; taste 等 e.g a. A paper tiger looks terrible , but in fact it is not . b. The medicine smells terrible . c. Ann felt very happy d. That sounds interesting . 3. 表示转变的连系动词有:become ; fall ; get ; go ; grow ; turn 等 a. Beijing is becoming more and more beautiful . b. Soon they fell asleep . c. The trees turn green and the flowers start to come out . 二. 系动词的特点: 1. 系动词不用于进行时和被动语态 2. 除make 等个别词外,几乎所有的连系动词都能跟形容词作表语,但不能跟副词. 跟名词作表语的有:become ; get ; look ; make ; prove; remain ; seem ; turn ; wear . 等 3.我们要特别注意:look ; smell ; taste 等词既可作系动词,也可作实义动词. 作系动词时后跟形容词做表语,作实义动词时则用副词来修饰这些动词.