zero conditional: https://www.perfect-english-grammar.com/zero-conditional-exercise-1.html
First conditional: https://www.perfect-english-grammar.com/first-conditional-exercise-1.html
Second conditional: https://www.perfect-english-grammar.com/second-conditional-exercise-1.html
Third conditional: https://www.perfect-english-grammar.com/third-conditional-exercise-1.html