谢谢你

xièxienǐ

Thank you (to you)

Sounds roughly like shyeh-shyeh nee

Literal meaning

thank · thank · you

谢
xiè
xie4
44th · falling
Thin “shyeh”, falling. This is the beat of the phrase.
谢
xie
xie5
·neutral
Light echo. Keep it short.
你
nǐ
ni3
33rd · dipping
Adding 你 makes it personal — you are thanking this person, not the room.

谢谢你的帮助。

Xièxie nǐ de bāngzhù.

Thank you for your help.