热心网友
I think you can say this sentence when you want to say that you feel happy or this(these) dish(dishes) is(are) very delicious.Maybe you can also use it on the weather.You always ask questions about English,don't you? （不懂意思就去查字典吧！）(Sorry!有点不礼貌!)
热心网友
How nice表赞叹或舒发感想:多么好啊.它可以用在许多你要表达赞扬的句子当中.
热心网友
比如，圣诞节快到了，有人送礼物，你可以说How nice！
热心网友
多么好!