Please help me to find the correct answer and explain
1.they left early so they _________ should be or might be in time.
2. i shall drink a bottle of milk while i _____________have or am having a rest.
3.i hope he ______________ can be or could be a teacher.
4. we wish the policeman ______________ to catch or catching the thief.
5. the mother watched the baby ____ to play or play in the bed.
6. we wish that we _______________ could pass or can pass the exam.
7. the thief begged the judge _______ to forgive or forgiving him.