Marker pens are in the cupboard if you ever need one.
Marker pens are in the cupboard should you ever need one.
f a customer wishes to cancel their booking, they should notify us within seven days.
Should a customer wish to cancel their booking, they should notify us within seven days.
f I wasn't good at maths, I would find this homework very challenging.
Were I not good at maths, I'd find this homework very challenging.
If I hadn't been busy this morning, I would have attended the meeting.
Had I not been busy this morning, I would have attended the meeting.
