更新时间2018-03-12 00:18:31
例1:Many pandas now live in nature reserves where their habitat_______(protect).
例2:This cycle_______(go)day after day.
例3:The Romance languages ______(compose) of seven groups of languages that all have Latin as their basis.
例4:Medieval Romances were tales_______(write) primarily in French verse about brave heroes.
这里的动词有时候要加系动词be,有时候不加,我想知道什么时候加什么时候不加
1. 加的be动词不是系动词,而是助动词。因为系动词后的成分是表语;
2. 被动语态(动词作谓语时)就得用be+过去分词;
3. 如果不是被动语态,而是分词短语不作谓语时(非谓语)就不用加be动词;
4. 如果是非谓语动词的被动式(现在分词:being done,不定式:to be done),那还是得加,但不是be。
动词所在的句子没有系动词要加1-3,第四句written修饰tales做定语不加系动词