Condition+and+requirement

Condition and requirement 1. As long as 2. Unless 3. on condition that (that = optional) 4. providing that (that = optional. We can also say provided that) 5. preconditions 6. In case of (note that in this particular expression, we do not say In case of a fire. In other situations, an article or pronoun would be needed after in case of) 7. in the event of 8. stipulation

9. unconditional 10. Assuming that (that = optional) 11. on the assumption that (that = optional) 12. prerequisites

13. terms / conditions 14. requirement 15. Failing that (that is needed here, as it refers back to the previous sentence. Failing that means that if the first option – telephoning us – is not possible, you should try the second option – send us an email) 16. otherwise