你nǐ有yǒu什shén么me问wèn題tí嗎má？

Do you have any questions?

这zhè个ge问wèn題tí很hěn难nán。

This question is very difficult.

我wǒ们men需xū要yào解jiě決jué这zhè个ge问wèn題tí。

We need to solve this problem.

这zhè个ge问wèn題tí很hěn难nán回huí答dá。

This question is hard to answer.

我wǒ们men遇yù到dào了liǎo一yí个gè大dà问wèn題tí。

We have run into a big problem.