If you struggle with verbs, here’s a quiz :
Have you learnt the base hiragana ?
Do you know the four verb groups (fourth is suru verbs which are so commun I felt they deserved the spotlight) ? Not evrything, just the concept of each.
Do you know what a base and a form is ?
If you at least know all of this, you just need to repeat and repeat seeing examples for it to stick in your mind.
But if one has trouble being understood, it won’t even work spamming it.
In summary :
First group (go dan = five columns) also known as う verbs
Second group (ichi dan = one column) AKA る verbs
Irregulars (suru kuru, add desu [even if it’s NOT a verb], aru, iru to said group)
Suru verbs (ex: to study = benkyou suru)
You start with the easiest group (ichi dan) to understand the base + terminasion structure.
Only present for now.
Taberu → Tabe + ru (dictionnary form)
Tabenai → Tabe + nai (negative form)
Tabemasu → Tabe + masu (polite form)
Tabemasen → Tabe + masen (polite negative form)
Now, irregulars :
Suru → Shinai, Shimasu, Shimasen
Kuru → Konai, Kimasu, Kimasen
Da → Dewanai (ではない), Desu, Dewa arimasen
Which you can also write Janai and Ja arimasen, IMO I find it simpler, and “normal” while Dewa is formal
Aru → Nai, Arimasu, Arimasen
Iru → Inai, Imasu, Imasen
With this, you can tackle most structures using these verbs AND suru verbs :
Benkyou suru → Benkyou + suru in the wanted form
U verbs / First group / Godan requires to understand bases :
Nomu → Noma Nomi Nomu Nome Nomo
Then you add the terminaison like ru verbs.
Nomu-> Base
Nomimasu → Base I + masu
Nomimasen → Base I + masen
Nomanai → Base A + nai