ad-lib + noun phrase
及物用法，ad-lib后直接跟即兴创作的内容。
The comedian ad-libbed a hilarious joke.
这位喜剧演员即兴编了一个搞笑的笑话。
即兴表演；即兴发挥
ad-libbed — past of ad-lib
即兴表演；无准备地表演。；vt. 即兴编造；即兴讲演；即兴演唱；即兴演奏
to perform or say something without preparation; improvise
即兴表演；无准备地表演。
perform without preparation
一般现在时
He often ad-libs his speeches.
他经常即兴演讲。
一般过去时
She ad-libbed a funny joke at the party.
她在聚会上即兴讲了一个有趣的笑话。
现在完成时
They have ad-libbed the entire scene.
他们即兴表演了整个场景。
规则变化，双写b加-ed/-ing
He ad-libbed a joke when he forgot his lines.
当他忘记台词时，他即兴编了一个笑话。
用法提示：“ad-libbed”是动词过去式，表示即兴编造。
The comedian is ad-libbing during his entire performance.
这位喜剧演员在整个表演中都在即兴发挥。
用法提示：“ad-libbing”是现在分词，表示即兴表演。
She often ad-libs her speeches to make them more engaging.
她经常即兴演讲，以使演讲更有吸引力。
用法提示：“ad-libs”是第三人称单数，表示习惯性即兴发言。
及物用法，ad-lib后直接跟即兴创作的内容。
The comedian ad-libbed a hilarious joke.
这位喜剧演员即兴编了一个搞笑的笑话。
不及物用法，不接宾语，表示在没有准备的情况下即兴表现。
When he forgot his lines, he simply ad-libbed.
当他忘记台词时，他就即兴发挥。
grammar · medium
易错句子He did an ad-lib during the show.
正确表达He ad-libbed during the show.
将ad-lib误用为名词宾语，而它作为动词应使用过去式形式adi-libbed。
grammar · medium
易错句子He ad-lib a funny joke.
正确表达He ad-libbed a funny joke.
遗漏了过去式变化，adi-lib的过去式应为ad-libbed。
improvise 和 ad-lib 都表示即兴，但 improvise 更通用，可指任何即兴创作，而 ad-lib 特指在表演中无准备地即兴发挥。
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