What is a Conditional Sentence?Ī conditional sentence is based on the word ‘if’. To have a general idea of how all the conditionals work, take a look at this overview so you can start to get an idea of what they are and when we use them. There are four conditionals in total and you will learn to use them gradually, obviously starting with the most basic ones – the zero and first conditional. Making conditional sentences is an everyday part of your native language, and introducing them to your English conversation can really improve your level of communication.