Telling someone to do something in Russian isn't hard, but there are 3 slightly different forms you may need. In this video we'll have a quick overview of what to do when the stem ends in a vowel letter.
Note: there's a typo – a misplaced stress mark around 2:00 – where открыва́ть and открыва́й should of course have end stress. Спасибо to sharp-eyed viewer geerthendrickx4108 for pointing it out. :)