What it means
てあげる expresses that the subject does something for another person as a favor or for that person's benefit. It follows the te-form of a verb and is often used when the speaker offers, promises, or describes an action that helps someone. The person who benefits is commonly marked with に. The polite counterpart is てあげます.
Usage note
てあげる can sound as if the speaker is emphasizing their own kindness, so it may seem presumptuous when used toward a superior or someone who does not want to be treated as a recipient of a favor. Use it carefully in such situations.
How to use it
私は妹に駅まで案内してあげます。
I will guide my younger sister to the station.
私は妹に駅まで案内してあげる。
I will guide my younger sister to the station.
Example sentences
引っ越しをする友達に、重い荷物を運んであげました。
I carried heavy luggage for a friend who was moving.
妹が安心できるように、駅まで迎えに行ってあげます。
I will go pick up my younger sister at the station so that she can feel at ease.
祖父のために、スマートフォンの使い方を説明