Hello, dun bother to glue it back, if needed, just need to go to the relevant authority to ask for a replacement copy, just need to be prepare to pay some $$$ for them to help him to process and also wait maybe few days/weeks for them to process can liao. (Also good to let him go thru the whole process of getting a replacement once, especially if it is very costly and very troublesome, then next time he will cherish his certificate with you more)
No worries ya, i am quite sure he is not the first person in SG to tear up such an impt document. In SG, many things can be easily resolve if got sufficient $$$ de. Without sufficient $$$$, that when even very tiny problem will suddenly become like damn big issue and quarrel or even fighting. (e.g. Why did you buy the XXX brand bread huh? you stupid or what, issit you dunno that YYY brand bread cost $0.50 lesser and got 2 slice more blah blah blah....)
Then again, SG is a very interesting place, there are family out there who live happily with a combine household income of $1,500 and have 3-4 children, there are also couple who made a combine income of more then $15K per month and will still say that they do not earn enough to start a family. Both family are totally not wrong. I mean who gave us the right to say they are wrong tio bo? We dun live in their household and will never know what exactly is going on de.
Individual couple just need to be very sure what kinda of life they want for themselves, as long as they can come to a genuine consensus and most importantly earn sufficient to support the type of life style that they want, then all will be ok de, otherwise it is just a matter of time when all hell broke loose. (Say ok to do without this and that OR want to provide this & that is very easy one during happy times. The fulfillment part many a time can be a very very different thing)
Jia you & all the best.