Даны предложения. их нужно поставить в вопросительную и отрицательные формы. также объясните , по какому правилу это делается. 1) my son was a pupil last year. 2) i was in kiev two weeks ago. 3) his friends were at our factory yesterday. 4) my daughter was at the nursery-school last tuesday. 5) wednesday was his day off last week. 6) our engineers were in volgograd last week. 7) we were happy to see them yesterday.