English version

ad-lib

From Longman Dictionary of Contemporary Englishad-libad-lib /ˌæd ˈlɪb/ verb (ad-libbed, ad-libbing)  [intransitive, transitive]PERFORM to say things that you have not prepared or planned when you are performing or giving a speech syn improvise I never use a script; I just ad lib the whole programme.ad-lib noun [countable]→ See Verb table
Examples from the Corpus
ad-libNo one could remember the song very well, so we had to ad-lib.The other actors were thrown into confusion when she started ad-libbing her final speech.Betsy forgot her lines and had to ad-lib the rest of the scene.
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Verb table
ad-lib
Simple Form
Present
I, you, we, theyad-lib
he, she, itad-libs
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Past
I, you, he, she, it, we, theyad-libbed
Present perfect
I, you, we, theyhave ad-libbed
he, she, ithas ad-libbed
Past perfect
I, you, he, she, it, we, theyhad ad-libbed
Future
I, you, he, she, it, we, theywill ad-lib
Future perfect
I, you, he, she, it, we, theywill have ad-libbed
> View Less
Continuous Form
Present
Iam ad-libbing
he, she, itis ad-libbing
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you, we, theyare ad-libbing
Past
I, he, she, itwas ad-libbing
you, we, theywere ad-libbing
Present perfect
I, you, we, theyhave been ad-libbing
he, she, ithas been ad-libbing
Past perfect
I, you, he, she, it, we, theyhad been ad-libbing
Future
I, you, he, she, it, we, theywill be ad-libbing
Future perfect
I, you, he, she, it, we, theywill have been ad-libbing
> View Less