One tense left, and it is the teacher's favourite thing about Spanish. Grammatically it is the subjunctive; here it is the mood tense, because all it does is show mood.
English has it, just used far less. Compare these two:
The feeling changes because of you be instead of you are. English builds it other ways too: had I gone, I would know, or not only is it a problem. Both invert the word order the way a question does, without being questions.
Forming it needs no new sounds at all. -ar verbs borrow the -er/-ir endings, and -er/-ir verbs borrow the -ar endings.
-ar verbs take -er/-ir endings, and the reverse
For the "we" form use -emos, not the odd i that turns up in vivimos and salimos.
Hablo would only swap one o for another, so it does not change that way. Instead hable covers I as well, and the same for coma.
I want you to wait is a peculiar English structure that most languages do not copy. Spanish, like French, Portuguese and Italian, says I want that you wait, and that second verb goes into the mood tense.
Quiero que esperes. (I want you to wait)
This is an obligatory use. Saying "quiero que esperas" is an error and will distract from what you are saying.
Quiero que lo esperes · ¿Quieres que te espere? · ¿Quieres que yo te espere?
When you express what you want in this way, you are putting your subjectivity onto the world, and what follows que takes the mood tense.
The uses divide in two, and both matter for different reasons.
A side benefit worth noticing. To build the mood tense you first have to work out what the verb would normally be, and only then switch it.
Clarify with the subject word when the form is ambiguous: ¿Quieres que yo te espere? pins down that it is me waiting.