Certainly, to express surprise, to say no, used to say yes, to apologize, No kidding, to express surprise, to say yes, to explain something, to refuse, In one hundred years, people …… on other planets (live), are living, will live, lived, live, Students …… with computers instead of books (study), study, are going to study, studied, are studying, Cars …… on gasoline (not run), don’t run, aren’t going to run, didn’t run, won’t running, My brother and I …… to the zoo yesterday. (go), go, have gone, went, are going, Some of the animals …… on the endangered species list for a long time. (be), are, were, have been, had been, Overpopulation and pollution …… the environment. (affect), affect, affected, have affected, are affecting

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