A lot of和lots of都是“很多”的意思，用法有两点值得注意。
第一，a lot of和lots of都可用来说可数（countable）或不可数（uncountable）名词，而动词应用单数或复数形式，则看那名词而定，和a lot或lots无关。
例如“A lot of/Lots of money was lost.（损失了很多钱。）”一语，lots之后不用were；“A lot of/Lots of people were wounded.（很多人受了伤。）”一语，a lot of之后也不用was。
第二，many/much和a lot of/lots of意思相同，但语气上，many和much没有a lot of那么随便，a lot of又没有lots of那么随便。所以，a lot of / lots of不宜用于谨严的写作，多见于口语；但问句、否定句口头上也多用many和much。
例如甲问：“How much time have we?（我们有多少时间？）”
乙可以说：“We haven't much time.（我们没有很多时间。）”或“We have a lot of/lots of time.（我们有很多时间。）”
向人道谢，说“Thanks a lot!”也比“Thanks very much!”随便。
此外，年、月、日、时等时间单位，不可和a lot of/lots of连用。
"a lot of" 和 “lots of “ 意思相同：两者的意思都是指”大量的或数目不菲的人或事“。
They are both used before countable nouns and uncountable nouns:
他们两者都可用于可数或不可数名词前：
with countable nouns 用于可数名词前:
A lot of people went to the game.
Lots of people went to the game.
with uncountable nouns 用于不可数名词前:
A lot of snow falls in winter.
Lots of snow falls in winter.
而 “a lot“ 则不同，
”a lot“ means very often or very much. It is used as an adverb. It often comes at the end of a sentence and never before a noun.
”a lot“ 意思是“经常” 或 “很多”。它作为副词使用，经常用在句子结尾，而从不用在名词前。如：
I like basketball a lot.
She's a lot happier now than she was.
I don't go there a lot anymore.
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