Conditionals 0,1,2
What do you do when you ______ (catch) a flu?
What do you do when you catch a flu?
What _______ (you, do) if you are homesick?
What will/do you do if you are homesick?
What would you do if you______ (can, be) invisible for a day?
What would you do if you could be invisible for a day?