表语就是能与系动词一起构成谓语的成分。可以是形容词,动词不定式,也可以是从句。系动词则分三大类:be动词,感官动词(smell,look,taste, feel,sound etc.),和“变得。。。”意的动词如get,become,turn,go 等。 例句:He is a student. His face turned red. The cake looks dilicious. 这三句中student, red 和dilicious 就是表语。 还有,My wish is to be a doctor. My suggestion is that you shoul go now. 这两句中,第一句,to be doctor 是表语,第二句,that 从句是表语。