1. Perfect Modals (B1 Grammar) B1 Grammar MasterClass 1. Perfect Modals (B1 Grammar) In this module, we will look at ‘should’ve, could’ve, would’ve, and must’ve’. These are really common in English speech but are a little difficult because they all have unique meanings. Module Content 0% Complete 0/1 Steps B1 Grammar – Module 2 Section 1: Perfect Modals Previous Module Back to Course