Mother has the habit of making shopping list when doing shopping.这里making 与doing为什么用进行时?

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Mother has the habit of making shopping list when doing shopping.这里making 与doing为什么用进行时?

Mother has the habit of making shopping list when doing shopping.这里making 与doing为什么用进行时?
Mother has the habit of making shopping list when doing shopping.这里making 与doing为什么用进行时?

Mother has the habit of making shopping list when doing shopping.这里making 与doing为什么用进行时?
Mother has the habit of making shopping list when doing shopping.
1.make 在介词of后面,故需用ing形式.
2.doing前面省略了she is.因此when doing sth常常可以作为状语从句.

of是介词,后面接动词Ing形式。后面由于主语一致省略了when(she is)doing shopping.

make在介词of后面,因此用-ing形式,后面意思应为当他正在购物时,因此用进行时,即doing

making是因为前面的介词of,doing是因为后面的when引导的时间状语从句省略了主语和谓语

of making shopping list 中的making 不是进行时,是名词性短语,修饰 habit 。doing shopping是省略了和主句相同的主语Mother和be动词is.
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of是介词

楼上解释的已经很好了
我补充一点Mother has the habit of making shopping list when(she is) doing shopping.
为什么可以省略呢,因为when引导的时间状语从句的主语she就是妈妈,是同一个人,所以可以省略!否则不可,省略必须是be doing、to do,be done, have done不能使用动词原型...

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楼上解释的已经很好了
我补充一点Mother has the habit of making shopping list when(she is) doing shopping.
为什么可以省略呢,因为when引导的时间状语从句的主语she就是妈妈,是同一个人,所以可以省略!否则不可,省略必须是be doing、to do,be done, have done不能使用动词原型

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