A subordinate clause doesn't form a complete sentence and contains a subject and verb.
So, the subordinate clause is "By the time they arrived."
The entire question is bold, bit I am assuming it is tasting. So I would say past. I don't know for sure, so let me know if I am right. Sorry, if it is not.
Thomas might have been using both meanings in the poem so that he can show how kind he is.
Who is young fortinabras?
