用正常的形式,不过要看两个主语情况,判断是否用第三人称单数.
比如:
Eating and sleeping are both important.那 writing and listening are important to learn English. 这句话对不对？前面对，后面的用法不对。be important to do 是说做什么事很重要，不能表示……很重要。你可以说writing and listening are important for us when we learn English