
話し方 means way of speaking or manner of speaking.
It is built from:
This pattern is very common:
So 話し方 is not just speech in general; it emphasizes how someone speaks.
は marks the topic of the sentence.
So in: 先生の話し方は優しくて、分かりやすいです。
the topic is 先生の話し方 = the teacher’s way of speaking.
Then the sentence says something about that topic:
A natural way to think of it is:
As for the teacher’s way of speaking, it is gentle and easy to understand.
Because 優しい is an い-adjective, and the correct て-form of an い-adjective is made by changing the final い to くて.
So:
That is why 優しいて is incorrect.
It connects 優しい to the next description, 分かりやすいです.
So:
Together: 優しくて、分かりやすいです = is gentle and easy to understand
In this sentence, て is mainly being used to link adjectives.
Usually, no. In this sentence it is most naturally just connecting two qualities:
So the meaning is: The teacher’s way of speaking is gentle and easy to understand.
It is true that て-form can sometimes show reason or cause, but here the simple and meaning is the most natural interpretation.
Yes. It is polite because it ends with です.
Polite version:
Plain version:
So this is a normal polite statement, suitable in everyday conversation and writing.
Yes, that can be said, but the nuance changes slightly.
In many everyday situations, both can work. But は feels very natural here if you are simply talking about the teacher’s way of speaking as the topic.
So:
Yes, that is a very natural English translation.
Even though the Japanese literally talks about the teacher’s way of speaking, natural English may use a verb:
All of these capture the idea well.