many, much與a lot of三者都表示“許多”。
many 和much即可用于肯定句中， 也可用于否定句和疑問句中
many隻修飾可數名詞複數，常構成how many, too many搭配
People cut down many trees, so animals are in great danger.
人類砍伐了大量的樹木，導緻動物處于極大的危險之中。
much隻修飾不可數名詞,常構成how much, too much, much too搭配
There is not much water in the bottle.這個瓶子裡沒有太多水了。
Thank you for telling me so much knowledge about nature.謝謝你告訴我這麼多關于自然的知識。
a lot of(＝lots of)既可以修飾可數名詞複數，又可以修飾不可數名詞,但是隻能用于肯定句中。如果要将含有a lot of(lots of)的肯定句改為否定句或疑問句，則必須用many或much代替。
There are a lot of students in the library.
否定句：There are not many students in the library.
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