wǒ búhuì yòng shǒujīyínháng.

I do not know how to use mobile banking.

Breakdown of wǒ búhuì yòng shǒujīyínháng.

• 我wǒ: I
• 用yòng: to use
• 手机银行shǒujīyínháng: mobile banking
• 不会búhuì: to not know how to; will not

Questions & Answers about wǒ búhuì yòng shǒujīyínháng.

Why is 不会 used here? Does it mean can’t or don’t know how to?

Here, 不会 most naturally means don’t know how to.

In Mandarin, 会 + verb often means to know how to do something or to be able to do it because you learned it.

So:

• 我不会用手机银行。 = I don’t know how to use mobile banking.

This is different from:

• 我不能用手机银行。 = I can’t use mobile banking
  (for example, because the system is down, your phone is broken, or your account is blocked)

So 不会 focuses on lack of skill or know-how, not outside circumstances.

Why is 不 pronounced bú in 不会, not bù?

This is because of tone sandhi, a pronunciation change.

Normally, 不 is fourth tone: bù.
But when 不 comes before another fourth-tone syllable, it changes to second tone: bú.

• 会 = huì (fourth tone)
• so 不会 is pronounced búhuì

This change is about pronunciation, not meaning.

Does 会 mean will here?