I do not support your assumption.
Your assumption is based upon few facts.
I brought a can of gas because I was under the assumption you needed it.
"My assumption is that he died long before he fell out of this window," said the Detective.
the idea that the sun is hot is an implicit assumption
People make assumptions quite often.
A sentence with assumption would involve making a statement based on a belief or supposition without concrete evidence or confirmation. For example, "Assuming it will rain tomorrow, I will bring an umbrella with me."
It'll take a lot of gumption to espouse that assumption. That's your assumption. That is not an assumption.
My assumption that she would be here on time was wrong.
The assumption was that the economy would only worsen .
ghikkl;l;
"Given the assumption that Jimmy was the sibling that broke the vase, he was grounded."
The assumption that all pies taste good is a societal fallacy.
When he found the "Dear John" letter and the closet empty, he made the assumption his girl friend had left him.