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UNIT 7 WHEN DID IT HAPPEN?
| POINT IN TIME |
| Nelson Mandela became president of South Africa | in 1994. on May 10, 1994. more than 20 years ago. |
| PERIOD OF TIME |
| Nelson Mandela led South Africa | from 1994 to 1999. during the 1990s. for five years. |
| PREPOSITIONS OF PLACE |
| at | the supermarket the bus stop the door |
| in | the U.S. the bedroom Asia |
| on | the wall the table the bookshelf |
Point in time Period of time
