Virtual expression: refers to a method of expression that is hypothetical rather than real. Which of the following are not virtual expressions? ['If you connect the brighter stars in Sagittarius, it is like a small spoon.', 'If the manager was on the scene yesterday, the problem would be solved.', 'Xiao Zhao dreamed many times that he landed on the moon in a spaceship.', 'Even if this machine is repaired, it will not play a big role.']