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In the example from the title, is it mandatory to use that?

The original sentence I picked up was from a checkbox marked

Confirm you are not a spammer

which I thought should be

Confirm that you are not a spammer

though I have seen a lot of usage without that after searching around.

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1 Answer 1

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You can omit "that" in "confirm that you are.."

After a verb of attribution the word “that” often can be omitted with no loss of meaning:

He said (that) he was tired. 
No need for "that." Better to omit.  

Using “that” is never really wrong (as most would agree), though it may be unnecessary/redundant; omitting “that” in some cases indeed may be wrong.

The mayor announced June 1 the fund would be exhausted. 
(“The mayor announced that June 1...exhausted”)

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