Subject (主语) ＋Link. V(系动词) ＋Predicate(表语)
这种句型主要用来表示主语的'特点、身份等.其系动词一般可分为下列两类：
(1)表示状态.这样的词有：be, look, seem, smell, taste, sound, keep等.如：
1、This kind of food tastes delicious.这种食物吃起来很可口.
2、He looked worried just now.刚才他看上去有些焦急.
(2)表示变化.这类系动词有：become, turn, get, grow, go等.如：
1、Spring comes. It is getting warmer and warmer.春天到了,天气变得越来越暖和.
2、The tree has grown much taller than before.这棵树比以前长得高多了.