Look at these imperative sentences:
Tu en prends trois. - Prends-en trois!You take three of them. - Take three of them!
Nous en mangeons. - Mangeons-en!We're eating some. - Let's eat some!
Nous en avons. - Ayons-en!We have some (of it). - Let's have some!
Notice that in L'Impératif, the pronoun en is placed after the verb with a hyphen in between.
In the 'tu' form, -ER verbs recover their original -s in front of en (for pronunciation reasons) :
Achète des pâtes ! Achètes-en !Buy some pasta ! Buy some !
Manges-en trois !Eat three of them !
See also Using "y" with affirmative commands (L'Impératif)
and Conjugate regular verbs in L'Impératif (imperative)
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