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三、表语
表语通常紧挨着系动词，位于系动词之后，用来说明主语的成分。
She is a girl. girl是表语
The weather turns cold. cold是表语
The skies grow dark. dark是表语
要提醒大家的是：系动词前边的主语和后边的表语必须匹配并且符合常理。
1. Old people aged 65 and over were 25%. 错误句子
2. Eating too much junk food becomes obese easily. 错误句子
Old people aged 65 and over were 25%.
老人不可以是25%，were前边的主语和后边的表语逻辑不匹配。
正确：The proportion of old people aged 65 and over was 25%.
Eating too much junk food becomes obese easily.
只有人才能变胖，吃垃圾食品这件事情不可以变胖。系动词become前边的主语和后边的表语在逻辑上不匹配。
正确：Eating too much junk food causes people to become obese easily.