why not 后面加动词原型,
如：why not go to the park?
why don't 后加句子,人称代词在前,
如 why don't we go to the park?
why not 后面加动词什么形式?why don't呢?
why not 后面加动词原型,
如：why not go to the park?
why don't 后加句子,人称代词在前,
如 why don't we go to the park?