Teaching English is never dull. There are rules for grammar and spelling, but we spend a lot of time on the exceptions to them, and that's when the fun begins.

English is a crazy language.  There is no egg in eggplant, nor ham in hamburger; neither apple nor pine in pineapple. English muffins weren't invented in England or French fries in France. Sweetmeats are candies while sweetbreads, which aren't sweet, are meat. And if we explore our language's paradoxes we find that quicksand can work slowly, boxing rings are square, and a guinea pig is neither from Guinea nor is it a pig. And why is it that writers write but grocers don't groce and hammers don't ham?

If the plural of tooth is teeth, why isn't the  plural of booth, beeth? One goose, two geese. So one moose, two meese?

If teachers taught, why didn't preachers praught? If a vegetarian eats vegeetables, what does a humanitarian eat? In what other language do people recite at a play but play at a recital? Ship by truck and send cargo by ship?  Have noses that run and feet that smell?

How can a slim chance and a fat chance be the same, while a wise man and a wise guy are opposites? Think about it: Your house can burn up while it burns down, you fill in a form  by filling it out, and an alarm goes off by going on.