This is a sentence of Future Indefinite Tense.
Passive Voice: will/shall + be + 3rd form of the verb.
"By" means next to or beside someone.
So, "My sister sat by my mom in the bus" is the correct sentence.
Sympathy for someone means کسی کیلئے ہمدردی ہونا
Examples:
He has no sympathy for beggars.
I have no sympathy for you.
I have no sympathy for him.
I have no sympathy for poor.
The correct phrase is "dependent on", meaning relying for support or help.
It means she relies completely on her parents for help or needs.
"He seems to be quite contented with his life."
"Contented" is commonly followed by "with" to indicate satisfaction or happiness with something.
"With" is the correct preposition in this context.
"From" is used to show removal or separation (taking something away).
So, "I had to take my book from the table" is correct.
"What would you like to drink, tea or coffee?"
آپ کیا پینا پسند کریں گے، چائے یا کافی؟
It is the proper way to ask someone for their preference between two options.
"The best" is the superlative form used when comparing one person against all others.
It means Kamal writes better than everyone else.