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Use one (not a or an) with day, night, morning, afternoon and evening, when the one means on a certain...
In the end means finally or at last, at the end means at the farthest point or part: There's an index at the end of this book. There's a holiday at the end of this month.
The adjectives easy, difficult, hard, heavy, good, etc., are generally followed by the active infinitive.
Before or when introduces a clause of time, if the verb of the main clause denotes an action completed before that of the time clause