There are 5 types of conditionals, and I haven't found any with continuous tense in 'if' clause.
Suppose there is a long radio show. Eventually the presenter says something like 'the secret code is 555'. Listeners may call to the office, tell that '555' code and win some prize.
I can say something like:
- If he listens to the show, he may win a prize.
- If he had listened to the show, he could have won a prize.
But how should I say about the process (of listening) itself instead of the fact? I mean, the duration of the show may be an hour, but presenter tells the code on 5th (10th, 21st etc) minute. So, you should not listen whole show to win a prize - only 5 minutes (10, 21 ...) from the beginning is enough. I believe the examples above imply that the person should listen the whole show.
Could you please suggest? Thanks.