They usually go to the zoo on weedends
过去式They usually went to the zoo on weedends
将来式They will usually go to the zoo on weedends
一般疑问句Do they usually go to the zoo on weedends
否定句They don't usually go to the zoo on weedends
对（划线①go to zhe zoo)提问what do they usually do on weekends?
对（划线②They）提问、who usually go to the zoo on weedends