*Native speakers do not know what Ichiban Verbs are. It's a term used to teach the students an easy way to learn Japanese verbs. Same with Yodan (or Godan).
There are more Yodan (or Godan) Verbs than there are Ichidan Verbs. That's why I'll teach you the Ichidan Verbs first.
Ichidan Verbs all end in the suffix -ru, there for they're easy to conjugate.
Verbs in Japanese only have to be changed to past tense form, otherwise it stays the same. (for present, future, and even plural tense)
If you hear the verb suffix changed to -masu or -imasu, it's only conjugated to the polite form.
To change an Ichidan Verb to past tense, take off the suffix -ru and add -ta
Example: Taberu (to eat) conjugates to Tabeta (ate).
Easy enough, right?
But be careful, there are Yodan (or Godan) Verbs that end in -ru which require a different suffix for past tense form.
Here's a list of Ichidan Verbs so you don't get confused.
Akeru - To Open
Shimeru - To Close
Dekiru - To be Able to
Oshieru - To Tell/To Teach
Todokeru - Deliver
Taberu - To Eat
Deru - To Leave/To Exit
Miseru - To Show
Okiru - To Get Up
Kotaeru - To Answer
Yameru - To Stop/To Resign
Shinjiru - To Believe/To Trust
Kanjiru - To Feel/To Sense
Nigeru - To Run Away/To Escape
Wasureru - To Forget
Tasukeru - To Save
Akirameru - To Give Up
Hajimeru - To Begin
Tsuzukeru - To Continue
Umareru - To Be Born
**Verbs do not have to be conjugated depending on person.
Example: The "To Be" verb (Is, Are, Am)
In English, you'd have to change depending on person.
But in Japanese it would stay the same unless in past tense form.
It's understood as the proper "To Be" form.