Hi!
I’m no expert at Japanese, though it’s probably what I spend most of my time on, so don’t take this piece like an actual lesson, but I wanted to list somewhere some things that have given me a hard time in Japanese. These are suffixes that I really consider to be conjugations, but that other people apparently don’t. Those in red are especially tricky in my experience because they are extremely common and not really easy to find in textbooks. I’ll keep updating this as I learn.
Root form:
These go after things like 話(はな), 見(み)
-ず/ぬ: while not doing
て forms:
These go after things like やって、喋(しゃべ)って、飲(の)んで、見(み)て、出(で)て、あって
-てみ(見)る: try to do something
-てある: something has been done
-ている: is doing something
-ておく: do something with a purpose
-てく(来)る: give something
-てください:please do
-てい(行)く: go something
-てあげる: give something
-てもらう: receive something
-てしまう: finish accidentally
-てしまいました: finish to completion
-ています: do something after a motion
-てす(済)ませる: make do with, finish with
-てなお: consequently, still, even though
Stem form:
These go after things like やり、話(はな)し、飲(の)み、喋(しゃべ)り、あり
-いえる: to be possible
-いがる: to seem like
-いなお(直)す: to again
-いあ(会)う: do to each other
-いき(切)る: do to completion
-いとお(通)す: do thouroughly
-いこ(込)む: do for a while, do inwards
-いぬ(抜)く: do an effort to do something to the end
-いだ(出)す: start doing
-いす(過)ごす: do for too long
-いのこ(残)す: to leave out from doing
-いと(取)る: do again for yourself, take
Under investigation:
-いか(掛)ける: ??? hanging ??
-いあ(上)がる: do upwards
-いつ(付)ける: do against
-いた(立)てる: stand to do?
-いい(入)れる: enter to do
-いかえ(返)す: to do in return
-いたお(倒)す: to kill by doing