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Maternity leave, bereavement leave, sick leave, vacation leave, leave without pay, etc.
leave, i leave it outside
The future tense of "leave" is "will leave" or "shall leave." For example, "I will leave tomorrow." or "She shall leave at 7 p.m."
No, the correct form is "Why did you leave?" using the past tense of the verb "leave."
The plural form of "leave taking" is "leave takings."