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Grammar Whizz  Unit 20   The Present Perfect Tense

                  The interrogative form of the present perfect tense:
                 现在完成时式的疑问句形式:

                  Auxiliary Verb ‘has’/‘have’   Subject    Past Participle
                                             +          +
                   助动词“has”/“have”               主语          过去分词
                  e.g.   Has + he + written?
                        Have + they + decided yet?

              ✿  It is often used with the adverb ‘yet ’.
                此形式常与副词“yet(还;已经)”连用。



                  The negative form of the present perfect tense:
                 现在完成时式的否定句形式:

                  Subject     Auxiliary Verb ‘has’/‘have’ + ‘not’  Past Participle
                           +                                   +
                   主语        助动词“has”/“have”+“not”                  过去分词

                  e.g.   Alan + has not + drawn.
                        The girls + have not + arrived yet.
                       英文语法小专家, 版权所有·侵权必究




                                       Common Errors
                           Wrong                                Right

                1.  Tommy  has  just  broke  the    1.  Tommy  has  just  broken  the
                   vase.                             vase.

                2.  My class teacher has taught in    2.  My class teacher has taught in
                   this school for 1990.             this school since 1990.

                3.  My father has not sell his car    3.  My father has not sold his car
                   yet.                              yet.








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