In English, to express something you've just done, you use the Present Perfect. In French, you need to use a specific expression.
How to say you've just done something in French
Look at these examples of Passé Proche:
In French, recent past actions are expressed with the phrase venir de + [infinitif], when in English you would use the Present Perfect with just = I have just done, he has just eaten, ...
You can also use venir juste de in French to emphasise how recent the action is.
See also Conjugate venir/tenir and derivatives in the present tense in French (Le Présent)
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