How would you translate "I forgot something" in French?
For example
1. I forgot the lesson today.
2. Yesterday I forgot my bag in my room.

Question

Answer

1 J'ai oublié la leçon aujourd'hui = I forgot the lesson today. (past )
j'oublie=I forget  (present)

Answer

to forget = oublier

I forgot something. = J'ai oublié quelque chose.
I forgot the lesson today. = J'ai oublié la leçon aujourd'hui. (I don't get what you mean, the sentence is a bit awkward even in English)
Yesterday I forgot my bag in my room. = Hier, j'ai oublié mon sac dans ma chambre.

Answer

J'ai oublié ***
to Forgot=oublier

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