1. by the end of vs until the end of. My company will have 100% telecommuting by the end of next month. --> My company will start it by January 31. My company will 100% telecommute until at least the end of next month. --> The telecommuting will last until at least January 31. If our company makes it clear that we will telecommute for a few months more... 2. math problems vs questions (+word pro..