Questions & Answers about qǐng xiān zài dēngjìdān shàng xiě míngzi.
请 is often used to make a request polite, similar to please in English.
In this sentence, 请先在登记单上写名字。 means something like Please write your name on the registration form first.
A few useful notes:
- 请 + verb is a very common polite pattern.
- It can sound like a direct instruction, but still polite.
- In spoken Chinese, the subject you is often omitted when it is obvious.
So the full idea is really:
- (你)请先在登记单上写名字。
- Please first write your name on the registration form.
先 means first.
It tells you that this action should happen before some other action, even if that second action is not said explicitly.
In 请先在登记单上写名字。, 先 comes before the place phrase and the verb:
- 请 + 先 + 在登记单上 + 写名字
This is a very common position for 先:
- 请先坐。 — Please sit down first.
- 你先吃。 — You eat first.
- 我们先回家。 — Let’s go home first.
So here, 先 modifies the action 写名字.