"Given the assumption that Jimmy was the sibling that broke the vase, he was grounded."
It'll take a lot of gumption to espouse that assumption. That's your assumption. That is not an assumption.
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.
You have the assumption that someone is going to help you cheat on your school work.
I do not support your assumption. Your assumption is based upon few facts.
My assumption that she would be here on time was wrong.
The assumption was that the economy would only worsen .
ghikkl;l;
I brought a can of gas because I was under the assumption you needed it.
To accept something without proof is to make an assumption. An example of a sentence using the word assumption would be: "She wished she hadn't made the assumption that the trip would be short; now all she wanted was to go home."
"My assumption is that he died long before he fell out of this window," said the Detective.
Placing a question mark at the end of a phrase does not make it a sensible question. Try to use a whole sentence to describe what it is that you want answered.