I really don‘t know which one to buy

来源：学生作业帮编辑：作业帮分类：英语作业时间：2024/05/22 07:12:11

I really don‘t know which one to buy
为什么用动词不定式
有两个动词吗
如果有请指出

这个是固定用法,如what to wear 穿什么 where to go 去哪里 .这些都是固定用法.疑问词+to do 形式.which one to buy充当 know 的宾语.谓语动词只有know 一个.
再问： don't know�ǲ��Ƕ��
再答： �ǵ� ��ν�ﶯ�ʡ�
再问： �ö��ʲ��ʽһ��Ҫ��
再答：大部分是这样。动词不定式充当前一个动词的对象。如 I want to sleep 。就有两个动词。

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