Questions & Answers about zhè shì kǎhào.
Mandarin usually does not use articles like a, an, or the.
So 这是卡号 can mean:
- This is a card number
- This is the card number
The exact meaning depends on context. In real conversation, the situation usually makes it clear which one is meant.
这 means this.
In this sentence, it points to something near the speaker, just like this in English.
Examples:
- 这是什么? — What is this?
- 这是我的卡。 — This is my card.
You may also see 这个, which also often means this one or this. In this sentence, 这 by itself is fine because it is followed directly by 是.