系动词是 be动词,和几个感官动词,表语的话,表语从句,实质上,系表结构中,系动词与表语联合充当句子的谓语成分,但是现在已经淡化了这个概念,你知道就好eg she is at workis虽说是系动词,但是它不足以充当句子的谓语,因...