Were we to have children Finally, inversion is possible, though I think less common, with this form of the conditional when we are talking about the improbable future. Again negative forms are not ...

Conditional gene targeting based on excision or inversion of loxP-flanked DNA segments by Cre recombinase is a powerful technology for the analysis of gene function, but unexpected expression ...

The most common mixed conditional combination is when we have a third conditional in the if-clause (if + past perfect) followed by a second conditional (would + infinitive) in the main clause.