일반적인 상황에서는 언제나 복수를 사용합니다....

What kinds of teachers do you like? plural(general situation)_ always plural

What kind of food do you like? 

          non countable

A: I like pasta. Italian food is really delicious.

A: I really like pancakes and waffles. They're so good. ... plural

What kinds of movies do you usually watch?

A: I usually watch romance movies and comedies.

A: I usually watch action movies. 

What kinds of clothes do you buy?

A: I buy stylish clothes. I like to look good.

A: I buy inexpensive clothes. 

Do you think computers are important? 

A: Yes, I do. We need computers for everything.

A: No, I don't. People lived for thousands of years without computers.