The phrase "let's presume" is correct and commonly used in written English.
It is often used at the beginning of a sentence to introduce a hypothetical scenario or assumption. Here is an example: "Let's presume that we have an unlimited budget for this project. How would you allocate the resources?".
Let's presume he's heeded his own advice this time around.
It's not clear if these numbers are GAAP or non-GAAP, but let's presume those are cash numbers and do not take into account non-cash expenses.
Let's presume it was his agent's idea.
Let's presume Theo cares about the fishes.
Let's presume that Wolffe's clients do not include the corporate interests with billions at stake in MSNBC and Washington's Topic A, the health care debate.
Let's presume that Bachmann is being accurate, and that the woman in question was not someone she heard about from a friend of a friend's cousin in Xenia, Ohio.
But even if every political hack were somehow winkled out of the public payroll, Governor Forrester (let's just presume for a moment) would start each year with a huge built-in deficit, even assuming the recurring deficits that have so bedeviled the State House recently do not recur.
As to the Littlest Stark aka Rickon – no word yet, so let's just presume he's still wandering the badlands with Osha and learning how to be the wildest Stark of all.
There is no visible indication of what they are chasing but let's just presume it is refugees.
You've got a whole bunch people who, let's just presume, are out for themselves.
But fine, let's just presume you spoke like a normal, non-mouth-breathing human being, and let's analyze your complaint that it's difficult to ask a woman out on a date in Toronto even though that's false.
