Je m'en suis aperçu.

English Translation

I could see that.

s’apercevoir de

  1. [remarquer] to notice, to see
    il ne s’est aperçu de rien = he didn’t notice ou see anything
    la couleur est différente mais on s’en aperçoit à peine = the shade isn’t the same but you can hardly see it ou it’s hardly noticeable
  2. [comprendre] to become aware of, to realize
    sans s’en apercevoir = inadvertently, without realizing it
    s’apercevoir que = to realize ou to understand that
    je m’aperçois que c’est plus difficile que je ne croyais = I now realize it’s more difficult than I thought
    il s’en est aperçu peu à peu it gradually dawned on him
    cet incident nous a fait nous apercevoir de sa vulnérabilité this incident made us realise how vulnerable he was

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