这个问题我怎么想都想不明白。
zhège wèntí wǒ zěnme xiǎng dōu xiǎngbumíngbai 。
However much I think about it, I can't figure this out.
他怎么说都不听。
tā zěnme shuō dōu bù tīng 。
Whatever you say, he won't listen.
这件衣服怎么洗都洗不干净。
zhè jiàn yīfu zěnme xǐ dōu xǐbugānjìng 。
However you wash this piece of clothing, it won't come clean.