Which of the following sentences should have commas added to offset a nonrestrictive clause?

Question

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Those shoes which were expensive should get me through many special occasions.
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The shoes I chose to wear are very expensive.
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Shoes worn for special occasions are often very expensive.
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The shoes that I wear will be appropriate for the occasion.

Answer 1

The sentence that should have commas added to offset a nonrestrictive clause is:

Those shoes, which were expensive, should get me through many special occasions.

In this case, "which were expensive" is a nonrestrictive clause, providing additional information about the shoes but not essential to the meaning of the sentence. The other sentences either do not contain nonrestrictive clauses or they are restrictive, meaning they are essential to the meaning and do not require commas.