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1.Sam already (to pass) exam
2.Don (not, to change)books in the library every week
3.Andy and Daniel (not,to prepare )for exams yet
4.Tony (not,to use) his dictionary now
5. The children (not,to play) in the yard since 2 o’clock

1. Sam already has passed exam

2. Don does not change books  in the library every week

3. Andy and Daniel have not prepared for exams yet

4. Tony is not using his dictionary yet