Uzupełnij zdania odpowiednią formą podanych czasowników - użyj czasu Present Perfect Simple lub Present Perfect Continuous.
I'm a teacher and this week has been a very hard one for me. Since last week, I ____ (correct) my students' notebooks, but I ____ (check) only about half of them so far. Also, for the last few weeks, some students from my class ____ (prepare) for a performance for a school ceremony next week. One problem is that Robbie, our main actor, ____ (not learn) his role properly yet!