what和how的区别
He did not know （what he could do about it） because it was too heavy for him to lift alone。do是及物动词，一定要跟宾语的，意思是他不知道要做什么，所以用what提问do的宾语名词。如果是用how的话，how不能用来提问宾语，所以必须是在do后面有名词的情况下使用，譬如说 He did not know how he could lift it alone because it was too heavy.句中lift就是动词do，宾语是it，所以用how提问
标签：what,how,区别
