1. The 1st conditional is used to talk about possible events in the future, such as predictions or promises, using the structure "if + present tense, will/won't + infinitive."
2. Examples include "If you read this book, you'll like it" and "If you are fit, you will go on the mission to Mars." Negation can be added by negating either the if-clause or the result.
3. Questions are formed by inverting the subject and will/won't, and short answers use will or won't. Unless can also be used to express the condition negatively while keeping the result positive.