Question

1.My brother has recovered the sitting room(a cleft sentence with the subject focus) .............. 2.The little boy greeted his grandfather in a strange language (a cleft sentence with the Adverbial) ........ 3The library doesn't have the book I need.The bookstore doesn't have the book I need (neither...nor) ........ 4.We could fly,or we could take a train (either...or) .....

Answer 1

1.My brother has recovered the sitting room(a cleft sentence with the subject focus)
-> It's my brother who has recovered the sitiing room.
2.The little boy greeted his grandfather in a strange language (a cleft sentence with the Adverbial) 
-> It was in a strange language that the little boy greeted his grandfather.
3The library doesn't have the book I need.The bookstore doesn't have the book I need (neither...nor)
-> Neither the library nor the bookstore has the book I need.
4.We could fly,or we could take a train (either...or)
-> We could either fly or take a train.