1. If he’s in London they will have seen him. In the event of his being in London, the speaker is expressing certainty that they have seen him.
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1. If he’s in London they will have seen him.
In the event of his being in London, the speaker is expressing certainty that they have seen him.
2. If he’s in London they would have seen him.
Similar to #1, but the speaker is less certain.
Don't try to fit labels to every conditional you meet. There are five