Bonjour
A- revient ► 3rd person singular <em>(he/she/it --> il/elle/on)</em>
Elle <u><em>revient</em></u> toujours de vacances très bronzée.
<em>She always comes back very tanned from vacation.</em>
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B- interviens ► 2nd person singular <em>(tu -> informal you)</em>
<em> </em> Tu<em> </em><u><em>interviens</em></u> toujours dans mes affaires.
<em>you always interfere in my business.</em>
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C- prévenons ► 1st person singular <em>(we --> we)</em>
<em> </em>Nous vous <u><em>prévenons</em></u> de notre départ la semaine prochaine.
<em>We inform you of your departure next week.</em>
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D- se souviennent ► 3rd person plural reflexive verb <em>( ils/elles --> they)</em>
<em> </em>Ils <u><em>se souviennent </em></u><em> </em>de très peu de choses. Ils ont une très mauvaise mémoire.
<em>They remember very few things. They have a very bad memory.</em>
<em />
EXPLANATION
as you can see , all these verbs have the same root which is VENIR
"intervenir" , se souvenir", "prévenir", revenir".......
other verbs you might have = "prévenir", "subvenir", "devenir", "provenir", "parvenir", "convenir", "parvenir" ......
so if you know <em>how to conjugate VENIR, you just have to add the prefix to the root conjugated which is venir.</em>
<em>-</em>
VENIR
je viens
tu viens
il/elle/on vient
nous venons
vous venez
ils/elles viennent.
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<em>examples</em>
je me souviens <em>(I remember)</em>
tu interviens <em>(you interfere)</em>
elle revient <em>(she comes back)</em>
nous devenons <em>(we become)</em>
vous prévenez <em>(you warn, let so know, tell..)</em>
Ils subviennent <em>(they support)</em>
<em>-</em>
hope this helps ☺☺☺