it is necessary to give your rabbit some clean water.(否定句)
问题描述：
it is necessary to give your rabbit some clean water.(否定句)
答
楼上的，否定就不用some了好吧。
It is unnecessary to give your rabbit clean water.
答
It is not necessary to give your rabbit any clean water
答
It isn't necessary to give your rabbit some clean water.
（否定前置)