He can’t possibly get that finished in time. He must be mad !
他不可能按时完成的。他一定是疯了！
I’d go mad (= start to feel crazy ) if I was stuck at home all day.
如果我整天困在家里我会发疯的。
Surely no one would be mad enough to fly in this weather?
肯定没有人会傻到在这样的天气条件下飞行吧？
My friends all think I’m stark raving mad (= completely crazy ) .
我的朋友都认为我是彻底疯了。
It’s enough to send you barking mad (= completely crazy ) .
这足以让你发狂。