"______ cats that you brought over yesterday were very cute!"
"The"
The cats are known to both speaker and hearer.
Milk
Non-count
This noun is a substance
A dogs bites people.
Specific
A cat was sleeping on the porch.
The cat was sleeping on the porch.
S2 indicates that it was a specific cat known to the speaker and hearer.
She adopted a cat and a dog from shelter.
"the" shelter
"I wouldn't mind _____ cup of coffee for my early class tomorrow!"
"A"
There is not a specific cup of coffee being referred to.
Dollar
Count
Dollars may be counted individually.
The cat purrs.
Specific
She wants to be a teacher.
She wants to be the teacher.
"A teacher" only implies the profession she wants. "The teacher" refers to a specific position.
I need an advice about this problem.
Get rid of "an"
Advice is not countable
"I bought a dog yesterday. _____ dog is very friendly!"
"The"
The dog is already mentioned in the first sentence, so it becomes unique.
Song
Count
Songs may be counted individually.
Dogs bark.
Generic.
Refers to dogs in general.
Children need special care.
The children need special care.
S1 speaks about children generally. S2 refers to specific children.
He is a best player on the team.
Use "the", not "he"
"Best" means that the player is unique
"Many people believe that ______ knowledge is power,"
Ø
"knowledge" is an abstract noun!
Music
Non-count
Can not be counted individually.
A bee sting can't hurt that much.
Generic
Refers to bee stings in general.
Freedom is essential for creativity.
The freedom is essential for creativity.
S2 implies specific freedom, where it is only implied generally in S1.
She believes the honesty is always the best policy.
No article for "honesty".
Abstract noun, general.
"There is a popular saying: 'Dogs are _____ man's best friends',"
"A"
This idiom uses a nonspecific, singular man.
Thought
Count
Can be counted individually.
The hyena is a species native to Africa.
Generic.
Refers to hyenas generally.
Beauty has inspired people.
The beauty has inspired people.
S2 refers to the beauty of something in particular, where it is an abstract noun in S1.
He wants a truth about what really happened.
Truth is specific and singular.