WE DIDN’T USE TO GO TO SCHOOL BY BUS, BUT NOW WE DO

2. - ENGLISH 9 BAI TAP TRAC NGHIEM NANG CAO
ENGLISH 9 BAI TAP TRAC NGHIEM NANG CAO

2. Negative:

Ex: We didn’t use to go to school by bus, but now we do.

(Wh- word)+ Did + S + use to + bare infinitive?