Mixed Conditionals or Mixed Type combines Second and Third Type conditionals. We again talk about unreal situations. We mix past and present/future to imagine an unreal result in the past or present.
Why do we use them?
There are two ways to use mixed conditionals. It is simply mixing past and present. We can talk about imaginary situations in past and their present results or talk about imaginary situations in the present and their relation to the past.
If you had studied more in the past, you'd be in the next grade now. (The speaker didn't study in the past and he failed in his grade now. The consequence is present and the reason lies in the past.)
If we had the key, we'd have entered the house. (I don't have the keys and I couldn't enter the house in the past.)
If my flight weren't so early today, I'd have met her yesterday. (My plane's departure time is early that I had to be home early to pack up yesterday. That's why I couldn't find time to meet her yesterday.)
How do we form them?
If Past Perfect Simple, Would + Infinitive
If Past Simple, Would+Have + past participle (V3)
Practice 3 (Reading Text)