Hello，teachers！ Which sentence is correct？Thankyou!

[Harry12345]

1 My favourite food is tomatoes and potatoes.
2 My favourite foods are tomatoes and potatoes？
3 My favourite pop music groups are Linkin Park and Backstreet Boys
4 My favourite pop music group is Linkin Park and Backstreet Boys ？

 

[meobeo]

Not a teacher, just a language lover.

I would say 2 and 3 are correct.

 

[emsr2d2]

I agree. You have given more than one example of a favourite so you need to use the plural.

My favourite food is cake.
My favourite foods are chocolate and cake.