Simple Sentences:
* I made the assumption that you were coming.
* His assumption was incorrect.
* The assumption that everyone is honest is dangerous.
More Complex Sentences:
* Based on the evidence, we can make the assumption that the suspect was at the scene of the crime.
* The company's financial success rests on the assumption that the new product will be popular.
* It's important to avoid making assumptions about people's intentions.
Sentences with different meanings of "assumption":
* The new CEO assumed her position last week. (This uses "assume" in the sense of taking on a role)
* The building assumed a strange shape due to the earthquake. (This uses "assume" in the sense of taking on a form)
Remember to choose the appropriate meaning of "assumption" depending on the context of your sentence.