Type:E-book, Graphic Organizer/Worksheet
Part of Athabasca University's Mobile ESL Course, Exercise 40.1 tests your knowledge of when to use the past simple or the present perfect.
Keywords:verb verb form base form -s form -ing form past form past participle be auxiliary verb do have imperative present simple affirmative statements negative statements questions past simple present continuous past continuous present perfect continuous present perfect past perfect modal verb can could may might will shall would must should have to need to needn&#8217;t be able to ought to have got to had better be going to use to simple formation continuous formation perfect formation non-per
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