supposing

Supposing is the present participle of the verb suppose and is used to introduce hypothetical or conditional scenarios. It functions similarly to phrases like “if we suppose” or “assuming that” and can set up a scenario for discussion or planning. It can appear at the beginning of a clause, as in Supposing we leave now, we should arrive by noon, or it can introduce a clause with that, as in Supposing that the train is delayed, we’ll reschedule.

Etymology traces suppose to Latin supponere, meaning to place under, with development through Old French supposer into English. The present participle supposing shares this lineage and is formed in the same way as many English stative and dynamic verbs.

Grammatically, supposing functions as a participle or gerund and is used to frame a hypothetical situation. It is not typically used as a noun. In modern usage it can appear in informal speech and in formal writing, though it often carries a cautious or tentative tone. Supposing can be followed by that, though the that is frequently omitted in everyday English.

Usage notes and examples:

- Supposing we miss the bus, we’ll have to walk.

- Supposing that it rains, we’ll cancel the picnic.

- Supposing you’re right, what changes would you propose?

In comparison with suppose or assuming that, supposing tends to emphasize the hypothetical nature of the scenario and can soften or hedge a conditional statement. See also: if, suppose, assuming that.