关于否定词和否定副词的疑惑:
1否定词是用来构成否定句的，那否定副词是用来做什么的？
2老师可以列举一些容易见到的否定词和否定副词吗？
准确来讲是：
否定助动词 来帮助句子构成否定句的，比如下面句子
They don't come from the same school.
Tom doesn't like being kept alone in the room.
Jack didn't come back from Beijing yesterday.
否定副词：not与助动词，情态动词一块构成否定助动词，并用来构成否定句，否定副词，可以直接否定动名词和不定式
Tom can't speak Chinese.
People are told not to take photos here.
Not having enough money, she can't buy the pen.
否定词：本身具备否定含义的单个副词，比如seldom, little,few, hardly, nobody , nothing , none, nowhere, never, scarcely,
They seldom watch television these days.这类日子他们极少看电视。
He has never been abroad.他从未出过国。
We hardly know each other.大家彼此还不大认识呢。