我喜欢夏天,而她喜欢冬天。
wǒ xǐhuān xiàtiān , ér tā xǐhuān dōngtiān 。
I like summer, but she likes winter.
他很聪明,而他的妹妹更聪明。
tā hěn cōngmíng , ér tāde mèimèi gēng cōngmíng 。
He is very smart, and his younger sister is even smarter.
这道题很简单,而那道题很难。
zhè dào tí hěnjiǎndān , ér nà dào tí hěn nán 。
This question is easy, but that question is difficult.