Verbs: YODAN conjugation

Here is the chart with examples verbs for YODAN.

	Meaning	Ending	ARUKU (YODAN): To walk	KAU (YODAN): To buy	SHIRU (YODAN): To know
I	Informal Negative Informal Past Negative Passive Causative	(verb)nai (verb)nakatta (verb)reru (verb)seru	ARUKA	KAWA	SHIRA
II	Formal Present Formal Past Formal Negative Formal Past Negative	(verb)masu (verb)mashita (verb)masen (verb)masendeshita	ARUKI	KAI	SHIRI
III	Informal Present (Dictionary Form) Period(When SV)	(verb) (verb)toki	ARUKU	KAU	SHIRU
IV	Conditional Potential	(verb)ba (verb)ru	ARUKE	KAE	SHIRE
V	Volitional Imperative (Command)	(verb)u (verb)	ARUKO	KAO	SHIRO

Let me explain how to look this chart.

The first column describes what base number belong to, namely BASE I, BASE II, BASE III, BASE IV, and BASE V.

Each base has different meaning by conjugating the verbs and putting the right endings which are described in the second and third column.

The rest of the columns are examples of YODAN verbs and how they are conjugated for each base.

HERE IS A QUESTION FOR YOU TO THINK ABOUT:
Can you see any patterns of the conjugation??

I hope the answer is YES. Let me describe the pattern!
As I said in the post before (click to review), YODAN verbs always end with U sounds.
ARUKU
HANASU
KAU   etc.

What you do is... you DROP the last U off of the verb, then add A, I, U, E, or O for Base I, II, III IV, or V respectively.

For example, if you want to conjugate ARUKU to the Base I, then you drop the U at the end, and add A on to it, so it is now ARUKA.  If you want to change HANASU to Base IV, then HANASE (the same process).

If this helps, here is teh formula...again. You drop U at the end of the verb, then you add
A for Base I
I for Base II
U for Base III
E for Base IV
O for Base V
at the end of the verb (or in other words, just replace the ending U with whatever you are conjugating to).