Page 153 - Specialised First Foreign Language 1
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The main verb is invariable in present participle

                                            form: -ing


                                            For negative sentences we insert not between the

                                            auxiliary verb and the main verb.


                                            For question sentences, we exchange the subject and

                                            the auxiliary verb.


                                            Look at these example sentences with the Present

                                            Continuous tense:



                                                  subjec      auxiliar            main

                                                  t           y verb              verb




                                              +  I            Am                  speaking  to you.




                                              +  You          Are                 reading      this.





                                              -   She         Is           no     staying      in

                                                                           t                   London

                                                                                               .





















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