bì
xū
1
to have to
2
must
3
compulsory
4
necessarily
从小妈妈就教我必须要遵守承诺。
From when I was young, my mother taught me I must keep my promises.
必须把药吃完才会好。
You must finish the medicine to recover.
这个決定我必须要认真考虑一下。
I must seriously consider this decision.