Another resource blog, this time with a bit of tense revision for ÊTRE in various tenses (including with modals) in the first person (i.e. the "je" form).
Follow this link to open the above menu screen, with access to about 30 interactive exercises.
Scroll down for a few pdf worksheets (in no particular order).
Note that you wouldn't expect students to do all of these (that would be daft!), but I've included all the possibilities so that you can see what is available.