〜てくれる: When Someone Does Something For You

The favour it lays on the verb

On its own, a verb just reports an action: モチが宿題を手伝った simply states "Mochi helped with the homework." Attach くれる and 宿題を手伝ってくれた now says "Mochi helped me out (and I appreciate it)." The extra layer くれる adds is gratitude — the action is reframed as a favor done, and always a favor that comes toward you.

That direction fixes the grammar. The doer of the kind act is the subject, marked with が or は. The person who benefits is the speaker (or the speaker's in-group), and because that is so predictable, Japanese leaves the beneficiary out entirely.

Which verbs it pairs with

くれる attaches to the て-form of almost any action verb — anything someone can do as a favor. くれる itself is a る-verb, so it conjugates regularly:

The one irregular cell is the last: when the giver outranks you, くれる is replaced by くださる, and its polite form is くださいます — never ＊くださります.

In use: in-group, respect, and requests

Because the beneficiary is understood to be the speaker's side, it drops out — but when the favor lands on someone in your in-group rather than literally on you, the named receiver takes に:

Here Yattan counts as part of the speaker's "side," so くれる still works even though the receiver isn't literally "me." When the giver is someone you respect — a teacher, a customer, an elder — reach for the polite くださる:

To turn the pattern into a request, make くれる or くださる a negative question: 〜てくれませんか or the softer 〜てくださいませんか ("Could you…?"). Both feel gentler than a plain 〜てください command:

How it differs from 〜てあげる and 〜てもらう

The three "favor" verbs sit side by side, and the difference is always who is the subject and which way the kindness flows:

• 〜てくれる — someone does for me. The giver is the subject; I receive the favor: モチが手伝ってくれた ("Mochi helped me").
• 〜てあげる — I do for someone else. I (or my side) am the subject, giving the favor outward: ヤッタンがモチを手伝ってあげた ("Yattan helped Mochi"). Be careful — said to the listener's face, あげる can sound like you're bragging about your kindness.
• 〜てもらう — I receive a favor (different subject). Here the receiver is the subject and the doer takes に: モチに手伝ってもらった ("I had Mochi help me / I got Mochi to help me").

So くれる and もらう can describe the same event from opposite angles: モチが手伝ってくれた and モチに手伝ってもらった both mean Mochi helped me — but くれる puts Mochi (the giver) in the subject slot, while もらう puts me (the receiver) there.

Three slips follow from missing that direction:

1. Using くれる for what you do for others. くれる only takes favors coming toward you. "I helped Mochi" is ヤッタンがモチを手伝ってあげた, not てくれた.
2. Dropping the て-form. It attaches to the て-form, not the dictionary form: 買ってくれた (✓), not 買うくれた (✗).
3. Marking the receiver with を. A named beneficiary takes に, not を: ヤッタンに買ってくれた (✓). And remember the polite giver is くださいます, never くださります.

The short version

• 〜てくれる = someone does something for me, felt as a kindness.
• The giver is the subject (が/は); the beneficiary is usually the unstated speaker.
• Polite giver → 〜てくださる (→ くださいます); request → 〜てくれませんか / 〜てくださいませんか.
• 〜てあげる = I do for others; 〜てもらう = I receive (receiver is the subject, doer takes に).

Practice it