If it's too much you can leave some. Do you need help?
You don't have to eat everything. Do you want me to help?
1) If it's too much you can leave some. Do you need help?
If it's too much = もし多すぎたら
you can leave some = すこし残していいよ
Do you need help? =助けが必要?
2) You don't have to eat everything. Do you want me to help?
You don't have to eat everything = 全部食べなくていいよ。
Do you want me to help? = 私に手伝ってほしい?
となります。ご参考にどうぞ。