Q:

When expressing a class of things, should I use a singular or a plural form?

When referring to a class of things, especially countable things, I am always confused about singular noun and plural nouns. For example:

Dogs are the most lovely animal in the world.

and

The most lovely animal in the world is dogs.

I know both sentences are grammatical correct because verbs only need to agree with the subject. However, those sentences sound awkward because of mixing singular noun and plural nouns.
So what is the best way to refer a class of countable things?

A:

You're nearly there.
Sentence 1 should read: Dogs are the most lovely animals in the world.
Sentence 2 should read: The most lovely animals in the world are dogs.
Generally speaking, plurals are accompanied by "are" when used collectively.
Also, in instances like these two sentences, Sentence 1 should be the sentence of choice as it is easier to read and follows a logical pattern.

