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  1. Newbie
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    Grammar question tags

    In this question tag
    The tickets cost us $50, didn't they?

    Why do we say 'didn't' instead of 'don't' or 'aren't'
    How does 'cost us' help to determine the correct answer?

  2. Piscean's Avatar
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    Retired English Teacher
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    Re: Grammar question tags

    The person uttering those words knew that they were speaking about a past-time situation.
    If the tickets generally cost $50 when we buy then, then the tag is 'don't they'.

    Context is essential with 'cost' - the past-tense form is the same as the present in all forms except the third person singular.

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