That-clauses are used to report statements.
- My friend recommended that I try this restaurant.
- She said that she'd had the salmon.
That-clauses can be used in conjunction with Wh-clauses.
- I know that what I did was wrong.
- He said that whether we had experience or not did not matter.
Wh-clauses are used to report questions with "wh" question words (where, why, when, whether, who, etc.)
- I was asked whether or not I was married.
- She asked him how the task should be done correctly.
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