主語補足語,通常位于主語之前或謂語動詞之后,當然放在謂語動詞被動語態(tài)的過去分詞之后,
一般表語都屬于主語補語.
如i feel nervous.
nervous即是表語也是主語補語.
被動語態(tài)時,主語補語不是表語.
如He was caught alive.
alive是主語補語,不是表語
①主語補語位于主語之前,后有逗號
例：Tired and sleepy,I went to bed
②有時位于主語之后,前后皆有逗號
例：Chen,only 1.30 metres tall,won the first prize.
③位于謂語動詞之后
例：He died young
He was found died.
④除形容詞外,名詞、數(shù)詞、不定式,分詞,介詞短語,從句也可作主語補足語.例：He came home quite changed.