谢谢你的帮助。

Xièxie nǐde bāngzhù.

Thanks for your help.

他真的帮助了我很多！

Tā zhēnde bāngzhùle wǒ hěn duō!

He really helped me a lot!

如果你需要帮助，可以告诉我。

Rúguǒ nǐ xūyào bāngzhù, kěyǐ gàosu wǒ.

If you need help, you can tell me.