不可省略do
Idon'tknowmanypeople.
什么样的people
asmanypeopleasyouknow.
加了people是为了让句子完整
比较Irunasfastaswind.把as...aswind去掉.Irunfast.句子是完整的.但如果把people也去掉,就变成Iknowmany.manywhat?句子就不对了.
而不能去掉do是因为会引起歧义.
Idon'tknowasmanypeopleasyou.我并不认识很多像你一样的人.
Idon'tknowasmanypeopleasyoudo.我并不像你一样,认识很多人.
Irunasfastasmybrother.为什么没有do?
does省略了因为不会产生歧义.加上does也没问题