Замените существительные личными местоимениями. 1.the teacher helped the pupils to translate the text. 2.mother asked mary to wash the plates. 3.my friend writes a letter to her sister. 4.jane took three books from jim. 5.his cousins live in moscow. 6.their grandmother and grandfather will come tomorrow. 7.mary work in a shop.

Если нужно поменять ВСЕ существительные, то будет так:
1) He helped them to translate it.
2)She asked her to wash them.
3)She writes it to her.
4)She took them from him.
5) They live in Moscow.
6)They will come tomorrow.
7)She works in it.