"Come to the office at five past seven."
Translation:Yediyi beş geçe ofise gel.
When talking about minutes that passed the hour, we use the expression
--> XX (hour - accusative case) YY (minutes) geçiyor
for example: 07:10
07 --> yedi 10 --> on
yediyi on geçiyor ("about the seven" ten passed)
-yi is one of the possibilities for the accusative suffix - other options are -yu/ yü/ yı/ yi/ -u/ -ü/ -ı/ -i (this is another part of Turkish grammar you might need to review, if you don't understand it here)
Now, if you want to talk about minutes preceding the hour, you use a different expression:
-->XX (hour +1 in dative case) YY (minutes) var
for example: 06:50
06+1 --> 7 (yedi)
10 --> on
yediye on var (to seven, there is ten)
-ye is one of the options for the dative case in Turish. Others are -ye, -ya, -e, -a
again, if you haven't learned about accusative and dative cases, I suggest you take a look here in previous Duolingo lessons or type that in Google and look for a website that can explain it better to you. Anyway, that's it, hope it helped :)