Is it possible to know if a verb is ichidan or godan from its other forms (e.g.: masu form)?


I have bee nreading [this](https://www.tofugu.com/japanese-grammar/verb-
conjugation-groups/) article about ichidan and godan verbs, how they are
conjugated and how to differentiate them from its plain form (食べる for
instance).

Is there any rule to infer if a verb is ichidan or godan given one of its
other forms? For instance, is it possible to infer that 食べる is an ichidan verb
from its 食べます form, or that 聞く is a godan verb from its -te form 聞いて?




I learned at school that we can infer the verb type from its ない form:

the sound right before ない has an あ(a) vowel ⇒ 五段(godan) verb  
the sound right before ない has an い(i) vowel ⇒ 上一段(kami-ichidan) verb  
the sound right before ない has an え(e) vowel ⇒ 下一段(shimo-ichidan) verb

For example, you can infer that...

聞く is 五段 verb from its ない form き **か** ない (kik **a** -nai)  
見る is 上一段 verb from its ない form **み** ない (m **i** -nai)  
食べる is 下一段 verb from its ない form た **べ** ない (tab **e** -nai)

* * *

You can also infer whether the verb is 五段 or 一段 type from its volitional form:

The volitional form ends with う ⇒ 五段  
The volitional form ends with よう ⇒ 上一段 or 下一段

For example, you can infer that...

聞く is 五段(godan) verb from its volitional form きこ **う**  
見る/食べる is 一段(ichidan) verb from its volitional form み **よう** /たべ **よう**

* * *

There might be more, but this is all that I can think of right now.

