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1) in we the classroom we
2) Mary new a has pencil got
3) Old children how are your?
4) Friend are my engineers

How old are your children?

we were in the classroomMary has got a new pencilHow old are children?My friends are engineers.

1) We are in the classroom.    2) Mary has got a new pencil.3)How old are your children?4) Engineers are my friend(s).  (в задании ошибки инженеры множ. число а друг ед. число так не должно быть) в 1 предложении вообще нет глагола.