Использовать глагол в скобках в нужном виде we would play football if i (not, be) raining. if i (see) him i would tell him everything. he (take) his dog with him if he had gone to the country.

we would play football if it's not raining.
if I see him I would tell him everything.
he would has taken his dog with him if he had gone to the country.