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情态动词。can , should ,can't ,shouldn't, may, must , would ,, haveto当这些词出现在句中时 后面的动词要是原型助动词。协助 主要动词的词 be, have, do, shall, will, should, would表语是用来说明主语的身份、性质、品性、特征和状态的，表语常由名词、形容词、副词、介词短语、不定式、动词的-ing、从句来充当。常位于系动词后，再加形容词作表语，与系动词 构成系表结构be, become, appear, seem,look,sound,feel,get,smell。... |
