This is a very fun lesson (NOT about spellings and synonyms) I have done with middle school students between grades 6-9 that shows differences between American and British English usage. Rather than describe it, I will let the worksheet directions tell you more:
"We all know about many of the word and spelling differences between British English and American English, for example what Brits call a "torch" is a flashlight and a "boot" is the trunk of the car to Americans. Brits spell color as "colour" and so on.
There are, however, some important differences between the way British English and American English is used grammatically that are not studied or talked about as much. Look at the sixteen sentence pairs below and decide which sounds best of the two choices. Then circle the one that sounds right to you. When you are done your teacher will correct it with you. Are you grammatically more British or more American? You will soon find out. Have fun!" Answers are provided.