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The third conditional talks about an impossible past situation and its result. Unlike Type 2, the conditional sentence type 3 consists of an if-clause in the past perfect tense, while the main clause uses a perfect infinitive.

Here are some examples of third conditional sentences:

If I had known you were coming, I would have baked a cake.
If she had arrived early, she could have gotten a good seat.
If they had left on time, they wouldn’t have missed their flight.
If I had found her address, I would have sent her an invitation.
If you had needed my help, I would have been there for you.

Mixed Conditional Sentence
Mixed conditional structure: If + past perfect, would/could/might + infinitive

The mixed conditional talks about a past situation and its present result.

Just like the other types of conditional sentences, it includes an if-clause and the main clause. The difference is its if-clause uses the past perfect tense, and the main conditional clause uses the present tense.

Here are some examples:

If I had known you were coming, I would visit you next week.
If he had studied harder, he would get better grades.
If she had arrived early, she could get a good seat.
If I had found her address, I would send her an invitation.
If you had needed my help, I would be there for you.
Different Types of Conditionals in Brief
There are five different types of conditional sentences. They are open condition, Type 1, Type 2, Type 3, and mixed conditional. Each of these conditional tenses focuses on specific situations. Some have simple paste tense, while others have a past perfect verb.