• Adverb

    at what time or period? how long ago? how soon?
    When are they to arrive? When did the Roman Empire exist?
    under what circumstances? upon what occasion?
    When is a letter of condolence in order? When did you ever see such a crowd?

    Conjunction

    at what time
    to know when to be silent.
    at the time or in the event that
    when we were young; when the noise stops.
    at any time; whenever
    He is impatient when he is kept waiting.
    upon or after which; and then
    We had just fallen asleep when the bell rang.
    while on the contrary; considering that; whereas
    Why are you here when you should be in school?

    Pronoun

    what time
    Till when is the store open?
    which time
    They left on Monday, since when we have heard nothing.

    Noun

    the time of anything
    the when and the where of an act.

    tác giả


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