Here are some examples of how you can use an expletive in a sentence, keeping in mind that I'm not actually using any offensive language:
For Emphasis:
* "Goodness, that was a close call!"
* "Crikey, I can't believe you did that!"
* "Well, I never!" (Here, "well" is used as a mild expletive.)
To express frustration or anger:
* "Darn it, I lost my keys again!"
* "Oh, shoot, I forgot to buy milk!"
* "Blast it, this computer is acting up!"
Remember:
* The use of expletives is highly dependent on the context and your relationship with the person you're speaking to.
* In formal settings, expletives are usually inappropriate.
* Consider your audience and the message you want to convey before using any expletives.
If you're unsure about the appropriateness of an expletive, it's always better to err on the side of caution and choose a different word.