double用作形容词的基本意思是“双的”,其所修饰的名词一般为单数。用作动词的基本意思是“对折起来”。作名词的基本意思是“两倍,双份”。
能做主语的6种词类
1， 名词代词作主语：
The flower is beautiful（这花好美哟）The flower是主语
They want to go dancing （他们想去跳舞）They是主语
I have a dream （我有一个梦想）I 是主语
2动名词可以做主语
Studing Engling is my hobbies （学英语是我的爱好）Studing Engling 是主语
Camping out is such great fun（露营很有趣）Camping out 是主语
3不定式作主语
To marry her is my goal（娶她是我的愿望）To marry her是主语
To do excise is good for your health（锻炼有益你的健康）To do excise
4名词性从句作主语
That she enjoys singing is known to all（她爱唱歌我们都知道）That she enjoys singing是主语
Whether he can do it is still in doubt（他能否做这件事还不确定） Whether he can do it是主语
5名词短语做主语
Where to meet her has not been decided yet（在哪里见她还没有决定）Where to meet her 是主语
6表示地点的副词短语作主语
From bejing to shanghai is a long way（从北京到上海很远）From bejing to shanghai是主语
注意提示：在英语中动词是不能直接做主语的，一定要变成动名词或者不定式。
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