Actually, no it would be left the way that it is. Because they currently can too. Could is being past tense, can is preset but also represents the past too. the that and who could go either way, doesn't matter. Still applies to them, 99% of the population in the world doesn't even say who right, including you. Who, what, where, and when are not said right. You may think you're saying it right because of all the people around you says it the same way, but none of you are. Family guy was correct ;P(If you saw the show with wheat thins)... Also the were is correct though.

You need to realize I also wrote that at 3am for me. So yeah, corrected you. Better to say that if you can't say who right.