the wind has died down a bit.这里的副词是down还是a bit呢

问题描述:

the wind has died down a bit.这里的副词是down还是a bit呢

The wind has died down a bit.
风已经减弱了一些.
动词die down应该视为谓语,这里的副词是a bit.那这里去掉down可以么 die是不及物这里?down不能去掉,因为die down是个词组,意思是变得越来越弱直到消失。否则意思是全变了。a bit用来表明程度。down去掉后语法还对么die是及物还是不及物动词die是不及物的,die down也是不及物的,去掉down以后语法还算对,但意思就不对了。