Give, get, lend, help
The giving triad, where direction picks the verb: away from me (ageru), toward me (kureru), I receive (morau) — plus lending (kasu) and helping (tetsudau), the favours that ride on it.
ageru
polite agemasugive (outward)
あげる あげます
Giving from me or my side to someone else (X ni ageru), and kore ageru means 'here, you can have this'.
kore tomodachi ni ageru.
I'm giving this to a friend.
これ友達にあげる。
kore wa tomodachi ni agemasu.
I'm giving this to a friend.
これは友達にあげます。
Offering to a superior with ageru can sound condescending.
Learn alongside: kureru, morau, -te kureru, -te morau, -te ageru
kureru
polite kuremasugive (to me/us)
くれる くれます
Someone giving to me or my in-group, with the giver marked by ga and the recipient (me) usually left unsaid.
kore tomodachi ga kureta.
A friend gave me this.
これ友達がくれた。
kore wa tomodachi ga kuremashita.
A friend gave me this.
これは友達がくれました。
Things given to you are never ageta: tomodachi ga kureta.
Learn alongside: ageru, morau, -te kureru, -te morau, -te ageruLearn first: ageru
morau
polite moraimasureceive; get
もらう もらいます
Receiving something, with me as the subject and the giver marked by ni or kara (X ni moratta).
kore tomodachi ni moratta.
I got this from a friend.
これ友達にもらった。
kore wa tomodachi ni moraimashita.
I got this from a friend.
これは友達にもらいました。
moratta and kureta describe the same event from two angles.
Learn alongside: ageru, kureru, -te kureru, -te morau, -te ageruLearn first: kureru
tetsudau
polite tetsudaimasuhelp (with a task)
手伝う てつだう 手伝います
Helps someone with a task, with the person or the task marked by o; later forms build on it: nanka tetsudaou ka? offers help and tetsudatte kureru? asks for it.
ashita no hikkoshi, tetsudau yo.
I'll help you move tomorrow.
明日の引っ越し、手伝うよ。
ashita no hikkoshi, tetsudaimasu yo.
I'll help you move tomorrow.
明日の引っ越し、手伝いますよ。
tasukete! is the cry for help; tetsudatte is for a hand with a task.
kasu
polite kashimasulend; let use
貸す かす 貸します
Lends something, with the borrower marked by ni; kashite (lend me) is the everyday way to ask to borrow or use a pen, a charger or a shop's bathroom.
chotto pen kashite.
Can I borrow a pen for a sec?
ちょっとペン貸して。
sumimasen, pen kashite kudasai.
Excuse me, could I borrow a pen?
すみません、ペン貸してください。
kashite is learned here as a chunk; the -te request itself comes in "Asking someone". Borrowing is kariru (ichidan): karite ii? = can I borrow it?, karita = borrowed.