"I sat" becomes "I sit".
Sit
I sit. He sat. He and I were sitting.
Set
The present tense is sit/sits. The past tense is sat. The present participle is sitting, and the past participle is sat.
"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.
Past tense: I sat. Present tense: I sit. Future tense: I will sit.
"Say/Says" is the present tense. "Saying" is the gerund or present progressive tense.
I/You/We/They sit. He/She/It sits. The present participle is sitting.
the present tense is say
No, said is the past tense. Say is the present tense.
Sitting is the present participle of the verb sit. The past tense of sit is sat.
The present perfect tense of say is:I/You/We/They have seen.He/She/It has seen.