1.lots of和a lot of可以当做定语,即当做many或much那样来使用。因此,谓语动词的数不是依据lot和lots来决定,而是依据of所引导的名词的数来决定,如:
A lot of time has been wasted.有许多时间给浪费掉了。(a lot of=much)
A lot of people have been present.已有许多人到了。(a lot of=many)
There is lots of time to spare.时间绰绰有余。(lots of=much)
2.a lot of=lots of表示”许多的“,可以修饰可数名词复数和不可数名词。
3.a lot是表示程度的一个短语,意为”很,非常“。如:thanks a lot(多谢);know a lot about China(对中国了解很多)
4.书面语用a lot of较多,口语用lots of较多。