Question

Come in and have some water.把这个祈使句改成否定句。

Answer 1

字面上可改为：Don't
come
in
or
have
any
water.相当于：Don't
come
in
and
don't
have
any
water.
但实际上是没有这种情况的。这本是口语中的一句邀请话，意为：请进来喝杯茶。是先进来然后喝茶，后者是承前者发生的，既然不进来，也就无所谓喝茶了。即，没了前者也就没有后者。
我个人认为，既然Come
in
and
have
some
water.与Will
you
come
in
and
have
some
water?相当，
只不过后者比前者更委婉些，那么前者的否定就可用
Won't
you
come
in
and
have
some
water?来构成否定。
以上为一家之言，仅供参考。