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あげるね

I'll do it for you

→ 上げる
phrase Uncommon #15,531
I'll do it for you Used after a verb to say that the speaker will do something for someone else's benefit. After a noun, あげる can mean "I'll give it to you." ね adds a friendly, reassuring tone. Depending on context, it can sound patronizing if the favor is unwanted or obvious.
JA: 荷物、持ってあげるね。
EN: I'll carry your bag for you.

何か飲み物を持ってきてあげるね。

I'll bring you something to drink.

買い物と、家の掃除、それから夕ご飯作ってあげるね。

I'll do the shopping, clean the house, and make dinner for you.

私が教えてあげるね

I'll teach you.

— 映画 聲の形 (2016)

お茶を入れてあげるね。

I'll make you some tea.

すぐ新しい棒みつけてあげるね

I'll find you a new stick right away.

— ハウルの動く城 (2004)

（将也）私が代わりに消してあげるね

(Masaya) I'll erase it for you instead.

— 映画 聲の形 (2016)

水足してあげるね。

I'll add some water for you.

— 崖の上のポニョ (2008)

おいしい夕食をつくってあげるね。

I'll make you a delicious dinner.

じゃあ、みんな、お迎えが来るまで、先生が絵本を読んであげるね。

Alright, everyone, I'll read you a picture book until your parents come to pick you up.