Originally Posted by weiqun ding
We often heard him sing an American song in the hall. :D
He was often heard to sing an American song in the hall. :D
How is everything? => Everything is fine. (Singular subject)
How are everything? (Incorrect. 'everything' is singular, so the verb should also be singular)
How are things? => Things are fine. (Plural subject)
How is things? (Incorrect. 'things' is plural, so the verb, too, should be plural).
All the best, :D