这个问题很难说。
zhègè wèntí hěn nán shuō 。
This question is difficult to say.
他的想法难说是否正确。
tāde xiǎngfǎ nán shuō shìfǒu zhèngquè 。
It is difficult to say whether his idea is correct.
关于未来，我们现在很难说。
guānyú wèilái ， wǒmen xiànzài hěn nán shuō 。
It is difficult to say about the future right now.