In the sentence, the clause ‘I found your number’ is used to explain why you being impressed. In this case, do we say ‘that,’ which is the conjunction for explaining, is omitted?
Top answer
The complementizer "that" in a direct-object clause is, in many cases, optional. He said (that) she loved him. Joe was surprised (that) we came.
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The complementizer "that" in a direct-object clause is, in many cases, optional.
He said (that) she loved him.
Joe was surprised (that) we came.
We knew (that) he was coming.
He felt (that) we could have done better.
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The complementizer "that" in a direct-object clause is, in many cases, optional.
He said (that) she loved him. Joe was surprised (that) we came. We knew (that) he was coming. He felt (that) we could have done better. We heard (that) the tragedy could have been avoided.
See "Clauses that function as direct objects" on the bottom of page 414