Mary's mother is working in a factory.( works-> working )
或Mary's mother者说worksin a factory.( 去掉IS )
(2)Are you driving now.( driveing -> driving )
(3)Listen!Li Ming is playing the piano there.( playing -> is playing )
(4）Ben likes talking with his pen pal on the phone.( talk -> talking )
（5）Mike is watching TV now.( watch-.> watching)