Accidents of this kind often occur. ✬

Didn't it occur to you to shut the windows? ✬

Earthquakes may occur at any moment. ✬

Did it not occur to you to close the windows? ✬

When did this occur? ✬

Most car accidents occur due to the inattention of the driver. ✬

Lightning can occur during a storm. ✬

Overlap can occur. ✬

I think it's unlikely that a situation like this one would ever occur again. ✬

When will that occur? ✬