Which subordinating conjunction completes the sentence: '________ you learn to swim, you cannot go on this trip'?

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Multiple Choice

Which subordinating conjunction completes the sentence: '________ you learn to swim, you cannot go on this trip'?

Explanation:
Subordinating conjunctions that set a restriction often use unless to express a negative condition. Unless you learn to swim, you cannot go on this trip means you must learn to swim; if you don’t learn, you’re not allowed to go. The point is a prerequisite: learning to swim removes the restriction and allows the trip. If you used the other options, the sentence would change meaning: If you learn to swim would imply you can go only after learning (a positive condition), Because would give a reason, not a conditional rule, and When would imply timing rather than a rule that must be met to participate.

Subordinating conjunctions that set a restriction often use unless to express a negative condition. Unless you learn to swim, you cannot go on this trip means you must learn to swim; if you don’t learn, you’re not allowed to go. The point is a prerequisite: learning to swim removes the restriction and allows the trip. If you used the other options, the sentence would change meaning: If you learn to swim would imply you can go only after learning (a positive condition), Because would give a reason, not a conditional rule, and When would imply timing rather than a rule that must be met to participate.

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