It was raining heavily.

Suddenly a thunder struck.

My son went to me and said he was scared.

"What's happened?" I said.

"It's thunder."

"It's a thunder."

Do we need to add indicate the amount for thunder when he was going to tell you the thunder just struck?


No, "a thunder" is never used because "thunder" is only used to mean a plural. You could say "a clap of thunder" or " the noise of thunder" but not just "a thunder".

By the way "what's happened" is grammatical but unnatural sounding. Normally people just say "what happened".

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