1) Since when .........you..........(buy) your dictionary ? have ... bought
>I ............ Since last year have bought
2). Lan and her brother (work) together for several months to provide good facilities for disable people
work
1) Since when ...have ......you.....bought .....(buy) your dictionary ?
>I .....have bought ....... Since last year
2). Lan and her brother (work) have worked together for several months to provide good facilities for disable people
1) Since when ...have......you...bought.......(buy) your dictionary ?
>I .......have bought..... Since last year
2). Lan and her brother have worked (work) together for several months to provide good facilities for disable people
1,Since when have you been bought your dictionary?
=>I have been bought my dictionary since last year.
2,Lan and her brother have worked together for several months to provide good facilities for disable people.