All conditional tenses tell us "what if..." Sentences that use conditional tenses have two parts. One part (or clause,) tells about a condition, or situation (if...). The other part tells about a result, or a possible result (then...).
You can use "then" in the sentence, but you don't have to. Both these sentences are correct: If you are late, we will miss the train. If you are late, then we will miss the train. Tip: When you see "if" in a sentence, the sentence uses a conditional tense. Present, Past, and Future We can talk about the present, the past, and the future using conditional tenses. Real and Unreal Conditionals tell us either about real (factual) conditions or unreal (unlikely) conditions. Examples: "If I were a bird, I would fly away." (Unreal) "If I work late, I take a taxi home. (Real) You will also see these terms: zero, first, second, third.
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