Learn English – “That that” vs. “that”

redundancyrepetition

Is "that that" or "that, that" redundant in sentences such as this:

The reason we are late is that that we had an accident.

or

The reason we are late is that, that we had an accident.

Is it ok if I just say:

The reason we are late is that we had an accident.

Best Answer

In this case, you only want one "that."

The reason we are late is that we had an accident.

The reason for this is that the construction is "the reason ... is that...".

Example of a double "that" --

"I think that that car is the fastest." (no comma)

Or, to use your original sentence, something like: --

The reason we are late is that that man's hesitation slowed us down.

(or something like that -- still no comma)