1.children/often have toothache?//eat lots of candy
=> Why do the children often have a toothache ?
Because they eat lots of candy.
2.you/be late for class yesterday?//miss the first bus
=> Why were you late for class yesterday?
Because I missed the bus.
3.her tooth/hurt?//have a cavity
=> Why her tooth is hurt ? Because it has a cavity.
4.they/not come to the meeting last night?//be busy
=> Why didn't they come to the meeting last night ?
Because they were busy.
5.she/go to the doctor?//have a headache
=> Why does she go to the doctor ?
Because she has a headache.
6.Minh/not say anything/yesterday?//be very nervous
=> Why didn't Minh say anything yesterday ?
Because he was very nervous .
7.we/brush our teeth after meals?//want to have healthy teeth
=> Why do we brush our teeth after meals ?
Because we want to have healthy teeth.