WHEN - I BUY A BIRTHDAY CAKE ___ IT'S MY BIRTHDAY. , WHILE - MY MOM IS COOKING ___ I'M BRUSHING MY TEETH. , WHEN  - I WAS WORKING ____ THE LIGHTS WENT OUT., WHILE  - JOHN IS DRINKING TEA ____ READING A BOOK. , WHEN  - PEOPLE BUY A LOT OF GIFTS ____ IT'S CHRISTMAS. , WHILE  - THE TEACHER IS GIVING THE CLASS ____ THE STUDENTS ARE LISTENING. , WHILE  - I'M WATCHING TV ____ HAVING BREAKFAST. , WHILE  - ANN IS STUDYING FOR AN EXAM ____ HER DAD IS WORKING ON THE COMPUTER. , WHEN  - SAM WAS SLEEPING ____ THE THIEVES BROKE INTO HIS HOUSE. , WHEN - THE CAT BROKE A GLASS ____ WE WERE HAVING LUNCH. ,

WHEN AND WHILE

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