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In this unit, I learnt 5 types of conditional sentences. Type zero is used when the consequence is irrefutable; Type one is used when the consequence is possible when the condition is satisfied; Type two is used when the condition and consequence are unreal; Type three is used when both past action and past consequence are hypothetical; Mixed conditional is used when the hypothetical past action is leading to a present hypothetical result. I also learnt that verb tenses, pronoun, question words, pattern and time preference have to be changed in reported speech.