Chia động từ :
1/ The thieves ( break into ) ............. houses for 2 years before they ( be finally caught ) ...............
2/ I ( complete ) .................. my uniwersity degree by 2014
3/ By the time you ( arrive ) ......... here next month . I ( study ) ............ in London
Chia động từ :
1/ The thieves ( break into ) .......HAD BROKEN...... houses for 2 years before they ( be finally caught ) ..........WERE FINALLY CAUGHT.....
2/ I ( complete ) ......HAD COMPLETED............ my uniwersity degree by 2014
3/ By the time you ( arrive ) ...ARRIVE...... here next month . I ( study ) ...WILL HAVE BEEN STUDYING......... in London