4. put the verb into the correct form. a) usually we (to have) classes on the campus, but today we (to go) to the training airfield. b) i (not to come) to the lecture yesterday. i (not to feel) very well. i hope my friends (to give) me the notes later. c) specialists from our research institute to finish) the experiment. they (to work) on it for a month. d) my telephone (to ring) while i (to play) basketball in the sports center. it (to be) my friend julie who told me i (to get) an excellent mark for my presentation. e) i want to go to this concert tomorrow. i think that i (to finish) writing my course paper. f) ssau (to cooperate) with oxford polytechnic for 10 years by the end of this semester. g) i (not to read) the book on history of aviation yet, so i (do) it all day tomorrow. h) – what is that noise? what (to happen)? - i (not to know). maybe the machine (to break down). j) do you know who (to invent) this kind of engine? k) i (to buy) this book last week, but i (to read) it yet. l) annie asked me how to use this machine, she (never to use) it before, so she (to know) what to do.
