题目内容
8．那个女孩高兴时，不是唱歌就是跳舞．When the girl is happy，she either sings or dances．
分析 When the girl is happy，she either sings or dances．
解答 答案：When the girl is happy，she either sings or dances．这里是说客观事实用一般现在时，当…时候用when引导的时间状语从句，主语是the girl三单，开心be happy，结合主语，故When the girl is happy，主句主语she代替the girl，不是…就是…用either…or…连接两对等成分，这里连接两个谓语，唱歌sing，三单sings，跳舞dance，三单dances，故答案是When the girl is happy，she either sings or dances．
点评 either…or…主要用于表示选择，其意为"要么…要么…""或者…或者…"，用于连接两个性质相同的词或短语．如：
You can have either this one or that one．你拿这个或那个都可以．
either…or…连接两个成分作主语时，谓语动词通常与其靠近的主语保持一致．如：
Either you or I am to go．你或我必须有人去．
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