Assalamu Alaikum
Your Ideas are nice, but you have just minor mistakes
My favorite season is Spring because the flowers was open and beautiful in this season.
My favorite season is Spring because the flowers bloom and look beautiful in this season.
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My favorite season is winter because in this season, the night was too long.
My favorite season is winter because in this season, the nights are longer.
I hope to be sentences is correct
I hope that the sentences are correct
jazakum Allah khieran for committing yourself
and doing your homework
and good job