I think I've heard both of the following two sentences:

That's a great idea.

That's great idea.

Are they both correct? Do they have any differences?

  • 1
    You can say "That's great", though. – Mr Lister Sep 8 '17 at 18:36

The first one is correct.

Usually in English, if you have a singular noun, you need an article, either "a" or "the", or a possessive (like "Bob's great idea") or the word "one".

| improve this answer | |
  • That's a good answer. – J.R. Sep 8 '17 at 15:56
  • But not, "That's good answer." :-) – Jay Sep 8 '17 at 18:50

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