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Hi everyone, this will sound very complicated at first, but just go through it a few times to understand it all!
This is some information regarding the stem changes on verbs. Like how English has endings -ing and -ed, Japanese has quite a few different endings for different reasons. First, I am going to remind you that there are two types of verbs.
The first type(easier to remember) is called "Ichidan Verbs." These are verbs that end in "eru" and "iru".
The second type is called "Godan Verbs." These are any kind of verbs that do not end "eru" and "iru"
There are a few verbs that end in "eru" and "iru" that are actually Godan Verbs, but we wont worry about that in this teaching.
In every verb, there is a thing called a base. That's basically the stem at the end of the very that can be changed. Below is a list of these bases (do not worry of their meaning or how they're used for now, that's explained below).
Ichidan Verbs:
*Base 1* - Drop the RU
*Base 2* - Drop the RU
*base 3* - Keep the RU
*base 4* - Change RU to RE
*base 5* - Change RU to YOU
*base te* - Change RU to TE
*base ta* - Change RU to TA
Godan Verbs:
*base 1* - Change U to A
*base 2* - Change U to I
*base 3 *- Keep the U
*base 4* - Change U to E
*base 5* - Change U to OU
*base te* - Change the last letter of the verb according to the chart below. For example, if the verb is "manabu" (to learn) you would change "bu" to "nda" if it's in the te form.
*base ta* - Same as te, except you change the e to an a
*U, TSU, RU == TTE
BU, MU, NU == NDE
KU == ITE
GU == IDE
SU == SHITE*
The verb "iku" in the ta form actually changes the entire word to "itta" even though the chart shows one t.
So now you're wondering "Ok, so what is the point of the bases and how do I use them for whatever?
That's where this following information comes in. This is what you need to memorize. Bases are depicted on how words are used in sentences regarding time and formality. Read the first chart below and explanation follows telling how to use it.
*__Formally speaking__*
*Present/Future tense* == base 2 + masu
*Present/Future negative tense* == base 2 + masen
*Past tense* == base 2 +mashita
*Past negative* == base 2 + masen deshita
Now that you seen this chart, pick a verb. Any verb, it does not matter whatsoever. In this example, we'll use taberu, to eat.
*first* ask if the verb you picked is Godan or Ichidan. Taberu is an ichidan verb since it ends in "eru"
*second* find a form you want to use it in (present/future tense, etc.).
*third* find out how it's created. For example, say I choose "Present/Future tense" for my verb. I would look at the list above and see "base 2 + masu".
*fourth* make your verb. So now I have decided I want to say "I will eat sushi" which is future tense. The list above says "base 2 + masu" so I am going to change "taberu" to whatever base 2 tells me to do. In the Ichidan verb list, it says "drop RU". So now my verb is tabe. The information above also says "+masu" so that means my verb is now tabemasu. So a complete sentence would be "o sushi o tabemasu" for "I eat sushi". Cool huh? The best way to remember formal phrases is the fact they all follow base 2. So if it's Ichidan, you drop RU. If it's godan, you change U to I (verb manabu would change to manabi).
"What about informal?" you ask? well here is the list below. This one is a little more complicated to learn:
*__Informally speaking__*
*Present/Future tense* == base 3
*Present/Future negative tense* == base 1 + nai
*Past tense* == base ta
*Past negative* == base 1 + nakatta
So say you wanted to say "I will shut up" which is future tense. And you wanted to say it informally (the verb is damaru). First is it Ichidan or Godan (godan)? Change it according to the rules. base 3 for future tense, so "watashi wa damaru" is informally saying "I will shut up."
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