Yïnggäi de. It’s my pleasure.

Example 1:
A: Xièxie nî de bängzhù.
B: Kèqi shénme, zánmen shì péngyou, yïnggäi de.

A: Thanks for your help.
B: You are too polite. We’re friends, it was my pleasure

Example 2:
A: Lî lâoshï, nín mêi ge xïngqï döu lái gêi wômen bûxí göngkè, wômen zhën bù zhïdào zênme gânxiè nín cái hâo.
B: Yïnggäi de, bié kèqi.

A: Teacher Li, every week you come to give us a lesson after school. We really don’t know how to thank you
B: You’re welcome. It’s my pleasure.

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When others say thanks to you, you may reply with this expression to show that you think it’s your obligation to help them.

Synonymous Expressions
Zhè shì wô yïnggäi zuò de.