Задайте вопрос к подлежащему. the children are playing football. football? the children are play football. football? the children are played football. football? the children were in the swimming pool. in the swimming pool? the children have got a lot of pencils. many pencils? the children are on holidays. on holidays?
Do the children play ...
Did the children be ...
Have got the children ...
Where are the children...