てくれる
te-kureru
Drop it and the grammar survives, but you sound cold
The picture What the other person did flies toward me like an arrow and lands. Gratitude rides in on that arrow.
Where the picture shows up in てくれる
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a kindness that reached me
友達が空港まで送ってくれました。
tomodachi ga kūkō made okutte kuremashita
A friend drove me to the airport.
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teaching that stayed with me
先輩が仕事を教えてくれました。
senpai ga shigoto o oshiete kuremashita
A senior colleague taught me the job.
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asking for the arrow
ちょっと手伝ってくれない？
chotto tetsudatte kurenai?
Could you give me a hand for a second?
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care aimed at me
医者が丁寧に説明してくれた。
isha ga teinei ni setsumei shite kureta
The doctor explained it to me carefully.
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landing on my side of the line
母が弟に自転車を買ってくれた。
haha ga otōto ni jitensha o katte kureta
Mum bought my little brother a bike.
Even if I am not the receiver, family counts as my side, so くれる. To an outsider it would be あげる.