系动词
（一）系动词包括be动词和半系动词.
（二）半系动词的用法：
1. 常见的半系动词有：get (变得),turn (变得),grow (变得),become (变得), fall (变得), look (看起来),sound (听起来),feel (摸起来),smell (闻起来),taste (尝起来),keep (保持),stay (保持),remain (保持),seem (似乎)等.
2. 半系动词的特点：
(1)半系动词在疑问、否定、倒装时,跟实义动词一样,都是借助于助动词.如 Do they look young? (疑问) / I didn’t feel very well yesterday. (否定) / That sounds interesting, doesn’t it? (倒装)
(2)半系动词后面可接形容词,这一点是实义动词所不具备的,它更象be动词,所以被称作半系动词.如 The cake tastes delicious.
(3)半系动词通常不用被动语态.如 The house looks big.