系动词是is
表语是being built
表语表示一个状态,是说这个宫殿正在被建.
谓语由简单动词或动词短语(助动词或情态动词+主要动词）构成.一般为实意动词.而不是助动词.
系动词,亦称连系动词（Link Verb）.作为系动词,它本身有词义,但不能单独用作谓语,后边必须跟表语,亦称补语（形容词）,构成系表结构说明主语的状况、性质、特征等情况.
The palace is being built.一个语法问题
2个回答
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