Are you sure you understand the definition of a sentence? It's a string of words that starts with a capital letter and it ends only when you reach the closing punctuation mark. It doesn't matter how many times "and" appears.
Both of them are main verbs?
Before you get tangled up with analysing sentences, perhaps you should concentrate on the basics of written English. We don't construct a question by writing an affirmative statement and then adding a question mark.
Yes, it is, though I use the term -ing form.
-ing forms are not finite parts of the verb. They do not show tense.
If they don’t show tense, how do I know what tense it is? Is it based on other part of the sentence? The sentence used the present perfect tense so why doesn’t it say “…, having emptied”?
I understand it is a sentence. Therefore, I said they are still SVO. The sentence is not "SVVO" or "SVOV".
*What does "they" refer to?
"It" and "the sentence" refers to "He came into the room and sat down".
I understood the above sentence.
The time of the situation is shown by the tense of the the main verb, and/or other time markers in the sentence
Because that wold place the act of emptying before the other situation.
That is irrelevant. You said I was taught only one verb could be placed in a sentence. We have clearly told you that what you were taught was untrue.
Delete 'a'.
I think I was not clear. What I really wanted to say was “main verb” . That my teachers only said “verb” was probably because we were children so they didn’t want to complicate things. What they meant was SVO.
Emsr2d2 and I gave you examples of sentences with more than one main verb.
The main point for my teachers is that we don’t say something like “I jump talk in the room”.
No one suggested that that would be a grammatical sentence. Of course it would need to be "I jump and talk in the room" (a rather unlikely sentence, for which I can think of no suitable context).
That is ungrammatical so teachers asked students not to write that kind of sentence. Some students would also write something like “I like read books.”
If I say “I cooked and listened to music”, which of the above structure should the sentence belong to?
If I was teaching somebody English starting at the basic level I might teach them something like S-V-O to start with. I don't know, but maybe you misremember what your teachers told you. Sentences with more than one verb are in fact quite common. (See below.)
I don’t know if I misremember, maybe. I think “one verb" only applies to a simple sentence. Your sentences are compound sentences.
There are two clauses joined by the conjunction 'and'. The first clause is SV, the second SVO.
