Are you sure you did this exercise by yourself?

这个练习真是你自己做的吗？

《牛津词典》

You did this asynchronously.

该操作是异步完成的。

youdao

You did this instinctively when you were a child.

当还是个小孩的时候你会本能地这么去做。

youdao

'Oh,I like this. Where did you get this? It's so pretty.'" The three Americans launched BeadforLife in two thousand four.

VOA: special.2010.06.28

What kind of surprises did you find when you did this?

大家在此过程中发现了哪些不可思议的事

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选

This is great when you want to express regret for something that you perhaps did not do.

当你想表达对一些过去没做成的事情感到后悔时，你可以使用这个句型。

I should have 课堂 - SpeakingMax英语口语达人

People look at you funny when you tell them, as if you did this to yourself.

FORBES: Tim Hasselbeck: QBs 'Don't Like' Breast Cancer Footballs Either

Find that time when you did this faster than expected, and tell interviewers about it.

FORBES: Fast Contributors Make More Money than Fast Learners -- Which One Are You?

You did this in one area, you stated an increase in internet traffic, but you should add more.

FORBES: How to Get a Job Interview