In the sentence, You sat down: You is the pronoun subject sat is the verb down is the adverb.
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Mark and I sat down for a meeting. "I" always goes last.
No, you set the book down or lay the book down, but you don't "sat the book down"
The past tense is sat down.
A spider sat down beside Miss Muffet.
No. Sat is a verb, as in, "I was tired, so I sat down."
I sat down.
I sat in a chair while watching television. Bob slowly sat down, but was still curious!
Her mother had a tete-a-tete with my grandmama for the miscellaneous fees that her grand-daughter was causing.
They sat down.
The passive form of "sit down" is "be sat down."