little bit,a bit,bit,little的区别?

题目

little bit,a bit,bit,little的区别?
The boy ia ( )thin but he is healthy.
应填上述哪个呢
他们的区别?

答案

a bit和a little都作"一点儿"讲,但用法不同.
1)a bit和a little在肯定句中修饰动词、形容词、副词和比较级时可以互换,表示"一点儿"的意思.例如:
The speaker spoke up a bit/a little so as to make himself heard more clearly.
演讲者把嗓门提高了一点儿,以便使别人听得更清楚.
2)a bit和a little在否定句中的意思恰恰相反,not a bit相当于"not at all"(一点儿都不);not a little相当于"very(much)"或"extremely"(很、非常).例如:
She is not a bit tired.(=She is not tired at all.)她一点都不累.
3)a little可以直接作定语修饰名词,而a bit则要在后面加of构成短语才能作定语,两者都只能修饰不可数名词.例如:
There is a little/a bit of food left for lunch.
午饭只能吃剩下的一点食品了.
4)a bit of的另一种形式是bits of,a little则没有这种变体.例如:Besides this,he used part of an old army wireless set,and some bits of wood.除此之外,他还利用了一部分旧的军用无线电发报机的一部分零件和一些木片.