because it will give you an opportunity to say "I want to be sure that this is done, has been done"

因为用这个句型，你就能表达“我想确认这事会做到的，或者已经做到了。”

Make sure 课堂 - SpeakingMax英语口语达人

You could use the "Is there" pattern to find out about whether there's a party and hopefully, you can receive an invitation.

你可以用“Is there”句型来确认是否有这样一个派对，希望自己能够得到邀请。

Is there 课堂 - SpeakingMax英语口语达人

You can use the "Do you" pattern to find out for sure.

你可以用“Do you”句型来向他确认一下。

Do you 课堂 - SpeakingMax英语口语达人