Too complicated Elisabet. Language learning is about sounds, cadences rhythms etc.
It is also about building up a complex system of words and meanings through context.
So really total immersion is the best way to learn a language - like a baby.
Grammar stuff is really the last leg...crossing the i's and dotting the t's
If you say:
"I was looking for the Lamb Chops yesterday in the fridge, but it was too late, my brother already ate them."
I totally understand you, even though the correct way to say this is:
"I was looking for the Lamb Chops yesterday in the fridge, but it was too late, my brother had already eaten them."