1.my parents (live) in beijing since 1949

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1.myparents(live)inbeijingsince19491.myparents(live)inbeijingsince19491.myparents(live)inbeijingsinc

1.my parents (live) in beijing since 1949
1.my parents (live) in beijing since 1949

1.my parents (live) in beijing since 1949
have lived

My parents have been living in Beijing since 1949.
或:My parents have lived in Beijing since 1949.

.my parents (have lived) in beijing since 1949
自从1949年以来,我的父母一直住在北京
这里考查since的用法:译作“自从…以来”
(1)接时间点:如 I have stayed in that country since 1995. 要求:谓v.用现在完成时,而且须是延续性动词

have lived或have been living
有since说明句子用完成时
have/has+动词的过去分词,构成现在完成时,have been+动词ing,构成现在完成进行时
祝你进步,有不会的可以再问我哦