"~ てぃる" mainly refers to the continuation of actions and events such as "going" and "doing".

てぁる "is a state, which means that the result of actions such as ふたをけてぁる" is just like we can't say "go", "~てぁぁ"

Second, the usage is different:

Both of them represent the living state of the action, and the best way to distinguish them is automatic morphology.

てぁる, followed by his verb, followed by を.

Today's topic, book, book, etc. (Book く, other verbs)

てぃる, followed by the automatic word, followed by が.

In the procession, you will enter the procession. (enter, automatic word)

Third, the expression difference:

てぁる followed his verb and expressed two meanings.

First, the result of the action is visible to the naked eye, which means that the action is continuing. For example, words written on paper.

Second, the result of the action is invisible to the naked eye, and it is generally "prepared in advance".

For example, those who meet the requirements will be notified. /the notice has been sent to the admitted person. Papers, books, materials and collections. /In order to write my thesis, I collected a lot of information.

Extended data:

かたぱ these three lines of letters are slightly lighter than Chinese at the beginning of the word, and even lighter when they are not at the beginning of the word, so light that they are mistaken for turbidity. So many people don't understand it and think it's tone sandhi. Actually, there is no tone change. Originally, these three lines of letters in Japanese should not be pronounced together with ka, ta and pa in Chinese.

On the other hand, when the Japanese study Chinese, the teacher will definitely remind him to use more force when making angry sounds. In order to master the pronunciation of three lines of letters, you can practice the sounds between ka and ga, ta and da, pa and ba.

Baidu Encyclopedia-Fifty Japanese Phonetic Names