我wǒ不bù确què定dìng他tā是shì否fǒu来lái。

I'm not sure whether he will come.

请qǐng告gào诉sù我wǒ是shì否fǒu方fāng便biàn。

Please let me know whether it is convenient.

是shì否fǒu去qù旅lǚ行xíng，你nǐ决jué定dìng吧ba。

Whether to travel or not, you decide.

请qǐng告gào诉sù我wǒ你nǐ是shì否fǒu同tóng意yì。

Please tell me whether you agree.

他tā是shì否fǒu参cān加jiā还hái不bù清qīng楚chǔ。

It is not yet clear whether he will take part.