In Present perfect^x, Plurals^x, Numbers^x

WANG CHUN wrote: 1. Ancient and modern human beings use their great intelligence to invent machines that help people lead a comfortable and convenient life. My problem with this sentence is that it is not possible for ancient human beings to do anything any more, so using the present tense...

Hey Blitz, 1) "are Amber and Joe going?" is correct. 2) "your son is not attending college since last two months": incorrect. "your son has not been attending college for two months now" is ok; but 'has not attended' would be better. "your son has not been attending college for the past two...