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I can read [here](https://www.wasabi-jpn.com/japanese-grammar/how-to-express-
difficulty-and-possibility/) and
[here](https://guidetojapanese.org/learn/grammar/easyhard) that 易い and 難い are
added to the "stem of the verb", but I don't really see how the examples I can
find then match this rule.

For sake of clarity, I provide here a definition of what a "stem" is from one
Japanese Grammar book (Lampkin 2004, 11):

> The stem of a verb is the part that gives the general action or meaning;
> that is, "walk", "do", "sing", "hear", "be", etc. The stem of Yodan and
> Ichidan verbs is what is left after removing the last syllable of the
> Dictionary Form. For example, the stem of _hataraku_ (work) is _hatara_ -,
> the stem of taberu (eat) is _tabe_ -, the stem of _iru_ (be located) is _i_
> -, etc.

> Except for irregular verbs _kuru_ (come) and _suru_ (do), the stem of a verb
> never changes. The stems of _kuru_ and _suru_ change with each base, and it
> is this that gives them their irregular quality

From the following examples I could find on the internet, the rule is not
applied, because otherwise we would have had 読やすい, 話やすい in the two first
examples.

この本は読 **み** やすい。

田中さんは話 **し** やすい人（だ / です）。

この 質問は答 **え** 難い。

この 文法はおぼ **え** 難い。

So what should be the form of the verb in the [doing something is easy/hard]
pattern?

**References:**

Lampkin, R. (1995). _Japanese Verbs and Essentials of Grammar_ , Passport
Books
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conjugations
What is the conjugation of the action verb in the [doing something is easy/hard] pattern?
With the clarification of Leebo, I was able to reach this understanding:

(1) The 易い/難い adjectives should be attached to verbs that are conjugated in
the Base 2 form (i.e. ending with the vowel -i) (This is the same Base to
which is attached ます).

(2) Ichidan verbs do not have a Base 2 form, so 易い/難い should follow directly
the stem of the verb, which corresponds to what we get when we remove the -る
from the Dictionary form of the verb (or -ます when the verb is conjugated in
-ます)

(3) So the two Ichidan verbs from the examples, when inside a [doing something
is easy/hard] pattern should indeed be 覚え and 答え (覚える/覚えます, 答える/答えます), while
the other two Yodan verbs should be 話し, 読み (Base 2 of 話す and 読む)

This answer is heavily based on (Lampkin 1995).
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