why don't you ____(invite,invitation) your cousin to your party?

why don't you ____(invite,invitation) your cousin to your party?
why don't you ____(invite,invitation) your cousin to your party?

why don't you ____(invite,invitation) your cousin to your party?
invite
why don't you do = why not do 表建议

选invite

invite是动词 invitation为名词
你为何不邀请你的堂兄去你的派对呢？

填入 invite 这里缺少一个动词，invitation是invite的名字形式，整句话翻译是：你为什么不邀请你的cousin来你的party呢？