"I sat" becomes "I sit".
The present tense of "sat" is "sit."
The present tense for "sat" is "sit."
I sit. He sat. He and I were sitting.
I/You/We/They sit. He/She/It sits. The present participle is sitting.
Past tense: I sat. Present tense: I sit. Future tense: I will sit.
"You are" is present tense, happening now,, while "sat" is past tense. so this sentence doesn't work. :" You are sitting writing this," although awkward is correct.
the present tense is say
The present tense is sit/sits. The past tense is sat. The present participle is sitting, and the past participle is sat.
The present tense of said is say.
The present perfect tense of say is:I/You/We/They have seen.He/She/It has seen.
SayPast tense - said.Present tense - say/says/saying.Future tense - will say.GetPast tense - got.Present tense - get/gets/getting.Future tense - will get.
"Say/Says" is the present tense. "Saying" is the gerund or present progressive tense.