Linking Words Activity For Elementary Modals Exercises for Class 11 CBSE With Answers – English Grammar We have already studied some of the uses of 'be' (is, am, are, was, were, being and been), 'do' (does and did) and 'have' (has, have, had)Be, do and have are Primary AuxiliariesThey help to form tenses, questions and negativesThey are also used in changing voiceLinguists generally agree that foreignlanguage fluency is achieved when linguistic processing switches from controlled to I can speak english fluently he runs