is not 的常用口语形式

Isn't it beautiful outside today?
今天外面不是很美吗？
Isn't she supposed to be here by now?
她现在不应该已经到了吗？
Isn't that the book you've been looking for?
那不是你一直在找的书吗？
Isn't this restaurant a bit expensive?
这家餐厅不是有点贵吗？
Isn't he supposed to be on vacation?
他不是应该在度假吗？
Isn't it obvious what's going on?
这个情况不是很明显吗？
Aren't you coming with us to the party?
你不是要和我们一起参加聚会吗？
Isn't it time we start preparing dinner?
不是该开始准备晚餐的时候了吗？
Didn't I tell you that would happen?
我不是告诉过你会那样吗？
Isn't it fascinating how technology has evolved?
科技的发展不是很有意思吗？