he has no suitcase.保持原意为 he doesn't have any suitcase.

问题描述:

he has no suitcase.保持原意为 he doesn't have any suitcase.
1.句中两个suitcase要不要变为复数.
2.he doesn't have a suitcase.这么改可以吗 (要说明原因)

可以不用变为复数,因为suitcase是一个可数名词.所以同时改为“He doesn't have a suitcase.”也是正确的(前面加了does来修饰第三人称单数,后面have变为原形).
还有例如:
He has a smart suitcase.他有一个漂亮的手提箱.