There's used to be many people smoking in the office,but now

There's used to be many people smoking in the office,but now nobody is allowed to
这里为什么用了smoking而不用smoke

achao2008 1年前已收到3个回答举报

aiwa0925 春芽

共回答了14个问题采纳率：85.7% 举报

你确定是there's used to?被动语态?习惯?
这里somking作定语补充完整为 people who are smoking.这里省略了who are.

1年前

jackylee25 花朵

共回答了7500个问题举报

动名词做定语，修饰 people
意思为在办公室吸烟的人
所以用smoking

1年前

小小悦幼苗

共回答了49个问题举报

uesd to do 是习惯做某事
used to doing 是过去常常

1年前

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你能帮帮他们吗

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