conditionals
PRESENT If we __________________ (not / work) harder, we
__________________ (not pass) the exam tomorrow.
don't work/won't pass
PAST If the students __________________ (not be) late for the exam,
they __________________ (pass).
hadn't been/would have passed
PAST If the weather __________________ (not be) so cold, we
__________________ (go) to the beach.
hadn't been/would have gone