i don't know what they were for中 for是什么作用如何翻译呢

i don't know what they were for中 for是什么作用如何翻译呢
i don't know what they were for中 for是什么作用
如何翻译呢

i don't know what they were for中 for是什么作用如何翻译呢
这是一个复合句：“I don't know”是主句,“what they were for ”是名词性宾语从句,其中“what”做从句的引导词同时也做宾语从句中的宾语成分,所以从句可以看成“they were for what”,而“for”做介词有“为,为了”的意思,所以翻译过来就是“我不知道他们是为了什么（用于什么）” 还有不明白的可以再问我

你好:
for 是表示目的的, 意思是"做什么....."

翻译: 我不知道他们是用来做什么的.


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