"He’s very attentive when his son is talking to him." in French

Il est très attentif quand son fils lui parle.

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Literal Breakdown

English	French	Learn
attentive (masculine singular)	attentif	Learn
when (conjunction)	quand	Learn
his; her (masculine singular)	son	Learn
speaks; is speaking	parle	Learn

The French translation for “He’s very attentive when his son is talking to him.” is Il est très attentif quand son fils lui parle.. The French, Il est très attentif quand son fils lui parle., can be broken down into 4 parts:"attentive (masculine singular)" (attentif), "when (conjunction)" (quand), "his; her (masculine singular)" (son) and "speaks; is speaking" (parle).