The subject of a sentence is the do-er of the action. For example: Sam drived a car.
"Sam" is the subject
"Drived" is the verb
"A" is an indefinite article
"Car" is the object, because it receives the action.
Answer:
Yes, the 'archaic' (formal) way of speaking was to place the 'not' after the verb. Now, we use the auxiliary verb 'do.'
Explanation:
Ex.: So, you say that you're smart. Well,<u> I think not. </u> (I don't think so.)
Change in tone and volume I think