外研版九年级上册M6U2有疑难,课文标题:How to be green句子1:Do you sort the waste before throwing it away?中,“throwing"为什么加ing?句子2:Do you open a window instead of turning on air conditioning?中,”turning"为什么

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外研版九年级上册M6U2有疑难,课文标题:How to be green句子1:Do you sort the waste before throwing it away?中,“throwing"为什么加ing?句子2:Do you open a window instead of turning on air conditioning?中,”turning"为什么
外研版九年级上册M6U2有疑难,
课文标题:How to be green
句子1:Do you sort the waste before throwing it away?中,“throwing"为什么加ing?
句子2:Do you open a window instead of turning on air conditioning?中,”turning"为什么加ing?
句子3:Do you take your own cloth bag when shopping instesd of using plastic bags?中,“shopping"和”using"为什么加ing?
句子4:Find out what can be recycled in your neighbourhood and take part in recycling programmes.中,“recycled”为什么加ed 以及“recycling”为什么加ing?

外研版九年级上册M6U2有疑难,课文标题:How to be green句子1:Do you sort the waste before throwing it away?中,“throwing"为什么加ing?句子2:Do you open a window instead of turning on air conditioning?中,”turning"为什么
before +doing of是介词,而且instead of doing when you are shopping可以简写为shopping,第一个ed是因为被动,第二个就是词组的用法