Hi ! 1.The first sentence is correct. 2.The second sentence means that your roommate like to eat dumplings,but not means he is hungry. You can say it like this:室友说他昨天吃了一天水饺，今天还想吃。－》怎么这么喜欢吃水饺？（不怕吃吐吗？哈哈！） 3.哥哥说他女朋友叫他做什么他都愿意，要他死也可以。The third sentence means that your brother hear the word of his girlfriend very much，or to say,he loves his girl friend very much.Do remember ,the main body should be your brother . You can say it like this:哥哥说他女朋友叫他做什么他都愿意，要他死也可以。－》他怎么这么听话？ 4.You can say it like this:看见朋友什么舞都会跳，而且跳的非常好。－》他们怎么这么厉害/聪明？ “好”的含义比较广泛，用“厉害”或者“聪明”会更合适。 希望对你有帮助，good luck!