Meaning & usage
~te ageru expresses doing something for someone else's benefit, viewed from the giver's side toward an equal or someone of lower status. It attaches to the te-form of a verb, as in 作ってあげる or 教えてあげる, and ageru itself conjugates as a regular ru-verb for tense and politeness. It can sound condescending if used toward a superior or when the favor was not wanted, so attention to relationship is needed.
Example sentences 6
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私がやってあげた方がよさそうね。
I think I should do it for you.
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日本語を教えてくれたら、スペイン語を教えてあげるよ。
I'll teach you Spanish if you teach me Japanese.
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アイス買ってくれたらチューしてあげる。
If you buy me an ice cream, I'll kiss you.
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夕食を作ってあげましょう。
Let me fix dinner for you.
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あなたの車、洗ってあげるよ。
I'll wash your car for you.
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私がしてあげられるのはこれだけよ。
This is all I can do for you.
In past JLPT papers
This came up in 2 past exam questions.