Third Conditional
To imagine a different past
'If' Clause
Main Clause
If it hadn’t rained yesterday
Past Perfect
we would have gone to the beach
Perfect Conditional
In place of would we can use other modal verbs: If it hadn’t rained yesterday we could have gone to the beach
*Mixed Conditional (Second and Third)
What didn’t happen affects the present
'If' Clause
Main Clause
If it hadn’t rained yesterday
Past Perfect
we would be at the beach now
Present Conditional