The manner in which verbs are used for suppositions is referred to as

How verbs are used for suppositions is referred to as hypothetical.

Suppositions are hypotheses or assertions without proof.

Suppositions are used to establish a belief or to assert a claim based on uncertain grounds.

Suppositions or hypotheses are written in present tenses with their concluding parts that end in past tenses, indicating that the condition they introduce may not be real.

Thus, how verbs are used for suppositions is referred to as hypothetical.

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the eye wink at the hand; yet let that be / which the eye fears, when it is done, to see.