4. Correct the mistakes:
f) Old man who lives next door is a pleasant person.
g) My father drives the old car. He bought a car in 1977.
h) Where did you put a cheese?
i) The dogs don't like cats.
j) Can you close door, please?

f) Old man who lives next door is a pleasant person.
Correct: The old man who lives next door is a pleasant person.
We need the definite article “the” because we are talking about a specific man who lives next door.

g) My father drives the old car. He bought a car in 1977.
Correct: My father drives an old car. He bought the car in 1977.
We use “an old car” because it is not a specific previously mentioned car in the first sentence. In the second sentence we use “the car” because we now refer to the same car more precisely.

h) Where did you put a cheese?
Correct: Where did you put the cheese?
“Cheese” is usually an uncountable noun, so we do not use “a” with it in this meaning.

i) The dogs don't like cats.
Correct: Dogs don't like cats.
When speaking generally about animals in a broad sense, we usually do not use the definite article “the”.

j) Can you close door, please?
Correct: Can you close the door, please?
We need the definite article “the” because we are referring to a specific door that is clear from the situation.