When shopping,we should refuse to use plastic bags这句话对吗,如果对,

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When shopping,we should refuse to use plastic bags这句话对吗,如果对,为什么when可以加动词ing就完事?这是什么成分……麻烦讲解下

这句话是正确的,这是时间状语从句的省略.补充完整是When we are shopping.状语从句中,主从句主语一致时,可以省略从句主语及be动词.
再问：状语从句中，主从句主语一致？什么意思……是不是When we are shopping，we should refuse to use plastic bags，这里第一个we和第一个we是同一个主语，所以可以省略When we are shopping的we are
再答：是的
再问：哦……非常感谢

When shopping,we should refuse to use plastic bags这句话对吗,如果对, We should use（） plastic bags to protect our environment. We really shouldn’t use plastic bags any more when shopping. The less plastic bags we use,the besser our future is.这句话说的对初二英语呃呃We should use （fewer） plastic bags to protect our envi 英语初一选择题*1We should stop ________ plastic bags for shopping.A We want to use( ) plastic bags.We want to be a friend of the We want to use -------plastic bags,we want to be a friend of 英语翻译We should use more shopping baskets　___ ___ ___ bags. 翻译这句：Told to hand over unnecessary plastic shopping bags the plastic shopping bags,chopsticks,to-go boxes and mineral 1.We should take our own cloth bags when shopping ____ using