a lot of 用于否定句还是不用于

在所有这些表示“很多”的词语中many, much 是最常用的词,它们既可以用于肯定句,也可以用于疑问句和否定句.例如:
Are there many people in the street?
街上有很多人吗?
There isn’t much time left.
剩下的时间不多了.
其它的词语都用于肯定句,日常会话中常用lots of, a lot of 或plenty of; 正式文体中常用 a great many, a (large) number of, a great deal of, scores of 或 dozens of 等.但若肯定句中有too, so, as, very或how 等词修饰时,则必须使用 many, much.例如:
The number of the people who lost their homes reached as many as 250,000.
无家可归的人数多达250,000人.
There is too much work to do.
要做的工作太多了.