Which is correct?

Certainly that was a good thing.


Certainly, that was a good thing.

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  • 1
    I think we need a bit more context. It seems to me they could be saying different things. – WS2 Nov 18 '14 at 23:20

"Was that a good thing or a bad thing?"

"Certainly, that was a good thing."


"Was this or that (or both) a good thing?"

Certainly that was a good thing.


For the given example, I'd go with the first (comma-less) option almost always.

Certainly that was a good thing.

I can't actually think of a time I'd use the comma.

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