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    以内

    Grammar & Usage

    postpositional word
    neutral

    How it works

    以内 (yǐnèi) is used after a noun, numeral, or phrase to indicate a limit, boundary, or range. It typically signifies 'within' that specified limit, either spatially, temporally, or quantitatively. It implies that the specified boundary is included.

    Sample sentences

    请在三天以内完成这项任务。

    Please complete this task within three days.

    这个房间的面积在20平方米以内。

    The area of this room is within 20 square meters.

    所有参赛者必须在18岁以内。

    All participants must be within 18 years old.

    Quick facts

    usage_note:Often used with a specific numerical or spatial boundary. Can be contrasted with '以外' (yǐwài) which means 'outside of' or 'beyond'.

    Mnemonic

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    Example

    请在三天以内完成这项任务。

    Please complete this task within three days.

    这个房间的面积在20平方米以内。

    The area of this room is within 20 square meters.

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