No, you set the book down or lay the book down, but you don't "sat the book down"
I sat down.
Mark and I sat down for a meeting. "I" always goes last.
Yes, "sat" is the past tense of the verb "sit," which is an intransitive verb. Intransitive verbs do not take a direct object, meaning you wouldn't say "I sat the book." Instead, you would say "I sat on the chair." Therefore, "sat" does not function as a transitive verb.
In the sentence, You sat down: You is the pronoun subject sat is the verb down is the adverb.
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The past tense is sat down.
In Irish it's "Shuigh Anna síos ar an mbord"
The correct way to say that is, he sat beside her.
"I sat" becomes "I sit".
A spider sat down beside Miss Muffet.
The past tense of "sit" is "sat." For example, "Yesterday, I sat in the park to read a book."
No. Sat is a verb, as in, "I was tired, so I sat down."