English example sentences with "optional"

An air conditioner is available as an optional extra.
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The word "the" is optional in this sentence.
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It isn't optional.
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Being challenged in life is inevitable, being defeated is optional.
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Pain is inevitable. Suffering is optional.
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Even though it's optional, you should still do the homework.
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It's optional.
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It's not optional.
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Wearing green is optional.
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The red-eyed knight is an optional enemy, but I recommend killing him to get his sword.
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Sideburns are not optional.
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The car is equipped with numerous optional accessories.
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Growing old is mandatory. Growing up is optional.
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In response to the pandemic, many universities went test-blind or test-optional, to accommodate those unable to take certain standardized tests.
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The nucleus and optional coda of a syllable are called the rime.
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In Lojban, verbal tense and aspect are optional.
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I prefer a language in which TAME, tense, aspect, mood, and evidentiality, are all optional.
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Latin was offered as an optional subject to only a few pupils at our secondary school.
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In Lojban, tense and aspect are optional and comprehensive.
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I don't really believe in languages with obligatory tense. I prefer a comprehensive set of tenses, aspects, moods, and evidentials in a language, and they're all optional for use.
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In an optimal language, there should be a comprehensive set of tenses, aspects, moods, and evidentials—TAME—which are all optional for use. Whether they would be expressed as verbal conjugations or particles to complement invariant verbs is a question of architectural design.
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To the US, international laws are optional.
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This is optional.
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There has to be a bare minimum of rules to keep language understandable, but anything beyond that should be optional.
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The recipe mentions nutmeg, but it's optional.
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