If you really want to learn a language then it's important to be able to understand the jokes told in that language. This is especially useful in English because jokes form an important part of the English language. Furthermore, you can use jokes as a way of testing your level of English. When you finally enjoy an English joke, it means that your knowledge of the language is really good! Finally, jokes can be an useful tool to learn.
Try this exercise. Fill in the blanks with the correct tense and see how the joke slightly changes.
Two Balloons (present tense version)
Two balloons ......... (float) across the desert.
One balloon ............. (say) to the other:
"Look out for the cactussssssssssss!"
Two Balloons (past tense version)
Two balloons ..................... (float) across the desert.
One balloon ............... (say) to the other:
"Look out for the cactussssssssssss!"
