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Assuming that meaning: reasoning without proof

Assuming the train is on time, we'll make it. It's useful when you're working things out without all the facts. But a similar phrase turns the same guess into a proven fact.

Assuming that means if we accept that, supposing that: you treat something as true for now and reason from there. Assuming that the train is on time, we'll reach the hotel before dinner. That is often dropped: assuming everyone brings a chair. It fits both conversation and writing.

How would you use assuming that?

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assuming (that) + subject + verb, + conclusion or question

  • Assuming that the train is on time, we'll reach the hotel before dinner.
  • Assuming everyone brings a chair, we have enough space in the garden.
  • That plan should work, assuming the measurements are correct.

What changed

First versionAssuming that the measurements correct, the shelf will fit.

RevisionAssuming that the measurements are correct, the shelf will fit.

In notes and headlines, the verb often disappears: measurements correct. But after assuming that you need a full clause with a verb: the measurements are correct.

Cambridge Dictionary

Given that means 'considering that', and the fact is already known: Given that the train is late, we'll miss dinner. Assuming that is only a supposition: Assuming that the train is on time, we'll make it. Mix them up, and a guess sounds like a checked fact.

Your turn

The figures haven't been checked yet. ___ they are correct, the total is 80.

(Assuming that / Now that)

Show the answer

Assuming that — The figures haven't been checked, so their accuracy is taken on trust: assuming that. Now that would present it as an established fact.

Estimate the budget for a trip or a party based on one unchecked assumption. Introduce it with assuming that.

Assuming that each table seats six people, we will need four tables for the group.

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