pronoun
1
BAD : One of the policemen started asking me many questions.
GOOD : One of the policemen started asking me a lot of questions.
BAD : We are given many tests.
GOOD : We are given a lot of tests.
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Many and much are used mainly in questions and negative sentences: 'Does he have many friends?' 'It appears that he doesn't have many friends.' In affirmative sentences, phrases such as a lot of and plenty of are used.
Note however that many and much are used in affirmative sentences after too, so, and as ('You ask too many questions.') and sometimes in formal styles ('Many accidents arise as a result of negligence').
2
BAD : It's important to understand why there is so many violence in our world.
GOOD : It's important to understand why there is so much violence in our world.
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See note at MUCH 1 (↑ much )
3
BAD : I had never seen so many and bright stars in the sky.
GOOD : I had never seen so many bright stars in the sky.
BAD : There are not many and interesting Sunday newspapers.
GOOD : There are not many interesting Sunday newspapers.
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many + adjective + noun (WITHOUT and ): 'He is convinced that many serious accidents could be prevented.'