The noun clause in this sentence, When I return the jacket is a big problem for me, is When.
This is known as a group of words acting all toghther as a noun. It is a dependent clause that takes the place of any noun in a senetence.
Hence, we can learn that to identify a noun clause in a sentence, a noun clause has a subject and a predicate because it is dependent and does not express a complete thought.
Note that noun clauses often starts with a subordinating conjuction or words like how, what, whatever, when, where, whether, which, who, whoever, whom and why.
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