By Commas, Affirmative sentences

Hi, I'd lke to offer some comments. - About "...so...as..." 1. The Emperor Augustus, it appears, commissioned an idealized sculptured portrait, the features of which are so unrealistic as to constitute what one scholar calls an "artificial face." My question is why can use "so... as"...

Dear,I am going to take GMAT exam. When I was practising, I met some grammar problems. Please help me to understand correctly about them.- About "...so...as..." 1. The Emperor Augustus, it appears, commissioned an idealized sculptured portrait, the features of which are so unrealistic as to...

Hi,this has been asked more than once I guess, but I decided to put it neatly this way:Consider: usually, often, rarely, sometimes.Where is it possible to place them in a sentence? I wrote my choices in blue.I do it. <--- this is an affirmative sentence.At the beginning: often (with or without...