Question

qual a forma interrogativa das frases
you helped your friends
.they worked on a farm
.the boys took their books
.she went to school
.they came by bus
.

Answer 1

do you help tour friends?
do they work on a farm?
does she go to school?
do they come by bus?

Answer 2

did you helpe your friends ?
did they work on a farm? 
die she go to school ?
did they come by bus ?

para toda frase no afirmativo,negativo,futuro no passado exige um auxiliar no caso do afirmativo (do) no caso de terceita pessoa ira usar o does  , negativo (do not ou don't), futuro (will ou won't (will not ) , no passado did para todas as pessoas.