成都有没有职高的旅游:怎样判断句子中的主语？

主语是一个句子的主题,是一个句子所述说的主体.它的位置一般居句首.可担任主语有单词,短语,从句乃至整句. 例如:

1. 名词做主语:
A tree has fallen across the road.(一棵树倒下横在路上).

2. 代词做主语:
He told a joke, but it fell flat(他说了个笑话, 但是没有把人逗笑).

3. 数词做主语:
Four from severn leaves three(七减四余三)

4. 名词化的形容词做主语:
Old and young marched side by side.(老少并肩前行)

5. 副词做主语:
Now is the time.(现在是时候啦)

6. 名词化的介词做主语:
The ups and downs of life must be taken as they come.(我们必须承受人生之沉浮).

7. 不定式做主语:
To find your way out is a problem.(你要找到出路很困难)

8. 动名词做主语:
Smoking is harmful to your health.(吸烟有害健康)

9. 名词化的过去分词做主语:
The disabled are to receive more money.(残疾人将获得更多的钱).

10. 介词短语做主语:
To Beijing is not that far.(去北京没有那么远).

11. 从句做主语:
Whenever you are ready is fine.(你什么时候准备好都可以).

12. 句子做主语:
"How do you do" is a greeting.("你好"是句问候语).

谢谢你提的问题, 希望对你有帮助!!

主语一般由名词,代词,动词不定室或者和他们类似的短语来充当.
可以借助谓语动词的时态以及宾语的发出者来综合判断