Is the sentence "If table tennis was easy, it would be called football"! correct?

The tense in question here is the past link mood of the verb to be, which is the same conjugation with every subject (I were, s/he were, you were, they were, we were).

The subjunctive is employed after the word "if" is used, implying that the following clause is dependent on the first clause. The subjunctive is also used when discussing hypotheticals, or expressing dreams, hopes or aspirations. "I wish I were a rock star," for example, or "If I were you, I'd be more careful."

Therefore, germs, you are correct when you say "If table tennis WERE easy," as it is a conditional sentence. Several native English speakers get this wrong daily.

Also, easy is an adjective, and it is not necessarily a relative adjective, which means that "If table tennis were easy" is AS CORRECT as "If table tennis were easier." The latter sentence implies that table tennis is already easy, whereas the former sentence implies that it is actually difficult.

link a pop quiz to test your skills and see if you learned anything!

Neither is correct. The correct way to say this is "If Table Tennis was easier, it would be called Football." You use the word 'Were' when you are talking about more than one thing. Example- "If those people were kinder" or "If that person WAS kinder"

If table tennis were easy,it would be called football.

Incorrect.

If it were easy, it would be called badminton.

Unless you know of a weird two-person version of football (get your mind out of the gutter!), there's no comparison, no matter how sissy you might find the sport in question.

In your T-shirt example, WAS is correct as it is possible that it may be easy.

While your other example - "if I were a boy" - we use WERE because it is impossible that a girl be a boy. That's what we call an "unreal" or unlikely condition. Like in "If I were you" (like I can't be you).

That's the difference.