used for a person, object, idea, etc. to show which one is referred to

Can you sign this form here for me? 请你在这个表上签个名好吗？

These books are too heavy for me to carry. 这些书太重了，我拿不动。

informal We met this girl (= the girl I am going to tell you about) in the hotel. 我们在旅馆里遇到这姑娘。

This is the one I want. 这就是我要的那个。

What's this? Is this what you're looking for? 这是什么？这是你要找的吗？

What's this I hear about you moving to Scotland? 我听说你要移居到苏格兰，是怎么回事？

used when you introduce someone to someone else

Harry, this is Joan. 哈里，这位是琼。

Tyler, this is Jake, who I work with at Thrive.

Sophie, this is Bryce. Bryce and I were at school together.

Jack, this is my cousin, Marina.

Let me introduce you to James. James, this is Tom.

already

I thought you'd be done by this time. 我以为你这之前已经完成了。

By this time, they'd both left.

Usually by this time we've sold out of sandwiches.

By this time her health was so bad, she couldn't work.

By this time, he had a wife and a son.

He's usually awake by this time.

By this time, I'm usually tucked up in bed, asleep.

this and thatidiom informal (also this, that, and the other)C2 各种各样的事情

as much as shown or to a particular degree

It was only about this high off the ground. 它离地面只有这么高。

She has never been this late for school before. 她以前上学从没有迟到过这么久。