"I need to be at work by 5 o'clock"
"It's better to be safe than sorry"
"She should be at school by now"
"My friend should be coming with us to the park"
"I could be doing my homework, but instead, I'm busy playing video games"
"We could be at the concert if we didn't have to work"
"It would be very difficult to finish all of my food"
"This day would be better if it wasn't raining"