ZERO CONDITIONAL - MUST MUSN´T

 EASY: 

https://www.liveworksheets.com/es/w/en/english-second-language-esl/906384

Zero Conditional interactive exercise for 3 | Live Worksheets

MEDIUM

Zero Conditional interactive exercise for 3 | Live Worksheets

HARD

https://www.liveworksheets.com/w/en/english-second-language-esl/44661

MEDIUM

https://www.liveworksheets.com/w/en/english-second-language-esl/1063654   MUST MUSN´T