My main question is; Even if can be used with subjunctive mood or something like indicative mood. Actually I do know Even if used with subjunctive mood. But my main point is latter one.
Before asking all of you about it, First of all, I have learned something about "Even if".
In the meantime, I double-checked again two meanings of "Even if" by dictionaries. https://www.oxfordlearnersdictionaries.com/us/definition/english/even_1#even_idmg_2 https://www.ldoceonline.com/dictionary/even-if https://www.englishgrammar.org/even-if-and-even-though/
Also I have got the following feedback
You use "Even if [condition]" when--despite the condition being false, the clause afterwards will still hold true.
I think this feedback would be right. But I don't agree with mentioning "false". Rather it contains unreal or hypothetical condition.
According to dictionaries, there are two kinds of usage about 2 sorts of meanings from https://www.oxfordlearnersdictionaries.com/us/definition/english/even_1#even_idmg_2
1. Despite the possibility that; no matter whether
2. Despite the fact that; even though
However, regarding 2. usage I think indicative mood sometimes looks applied to 『Even if clause and main clause』.
For example from https://www.lexico.com/definition/even_if
• ‘My mother always did her best for me, even if there wasn't always enough to go around.’
• ‘It was a brilliant piece of reactive warfare, even if it was not wholly successful.’
• ‘They never doubted his love, even if he could not put it into words the rest of us would understand.’
Do you think those 【even if ~ clauses】 mentions unreal or hypothetical condition? I don't think so. They now conveys real facts. Furthermore, If subjunctive mood is applied to those sentences, maybe be-verbs in them have to be inflected to "were" regardless of persons. As well main clauses have to come with modal verbs such as would / could / might / should. But as you can the above, subjunctive mood is not applied.
When I compare 1 usage's example sentences in Lexico website, the subjunctive mood is obviously applied to even if clause.
• ‘It does not matter, even if it were to be clearly established that it had gone astray in the post.’
Therefore, if my reasoning is correct, I can say the following sentence.
- Context: Mr. TJ is a good teacher. Now I have a chance to take his class, but I will not take his class due to some reasons such as scheduling conflict or something.
→ Even if Mr. TJ is a good teacher, I will not take his class.
= Mr TJ is a good teacher. In spite of it, I will not take this class. .
- Context: Mr. TJ was a good teacher, I will not take this class.
→ Even if Mr. TJ was a good teacher, I will not take his class.
= Mr. TJ was a good teacher. Despite the fact, I will not take his class.
(Maybe no native speakers say 2.-sentence. It is grammatical, though.) .