I presume 's is abbreviation for is and not the possessive form. If this is the case, why do we use a singular verb with many?
And why time and not times?
I presume 's is abbreviation for is and not the possessive form. If this is the case, why do we use a singular verb with many?
And why time and not times?
The time is the subject, not many:
Manypredicative complement 'scopula the timesubject
Usually the subject comes before the verb, but in this construction the subject and copular complement are inverted! How can we tell?
Manypredicative complement arecopula the timessubject
The verb changes form to are! So we can see that it's agreeing with the right-hand side, not the left-hand side. (The plural version has the same meaning.)
Following either version is a relative clause of some sort, modifying the time(s).
It can be a wh-relative:
Many are the times [ when a designer must sacrifice speed to attain some important feature ] .
It can be a that-relative:
Many are the times [ that he refused payment for his services ] .
Or it can be a bare relative:
Many's the time [ ∅ I've found myself surrounded by a swarm of angry hostiles ] .
Whether it's singular or plural doesn't really change the meaning here.