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when,though等词是否具有介词词性

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when,though等词是否具有介词词性
看到这样的句型
I always listen to music when doing my homework.
(I always listen to music when i do my homework的简单句)
Though working as a nurse,she prefer to dance and hang out with friends.
觉得很奇怪,既然when though是连词,后面怎么接动名词,它们具有介词词性吗?
when,though等词是否具有介词词性
这是一个省略句.原句应为 I always listen to music when I am doing my homework.
在状语从句中,如从句的主语和主句一致,常将主语和be动词省略.如
When published,the novel will become one of the best sellers of the year.
那本小说出版的时候就会成为当年的畅销书之一.
When ripe,the grapes will be delicious.
当葡萄成熟之后就会很好吃.
如果主语是it,经常省略it和be动词.如
Fill in the blanks with articles where (it is) necessary.