Conditionals or Conditional Sentences are also
known as Conditional Clauses or If Clauses. They are used to express that the
action in the main clause (without if) can only take place if a
certain condition (in the clause with if) is fulfilled. There are
three types of Conditional Sentences (I, II, and III) or others say that there
are four types (0, I, II, and III).
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