Once means one time, at some time in the past, or as soon as. I've been there once. This building once housed a small cinema. Once the paint is dry, we can move the shelves back. If a full clause with a verb follows once, it almost always means 'as soon as'.
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once + clause / once a + time period / once + past-tense verb
- Once the paint is dry, we can move the shelves back.
- The group meets once a fortnight.
- This building once housed a small cinema.
What changed
First versionOnce the paint will be dry, we can move the shelves back.
RevisionOnce the paint is dry, we can move the shelves back.
The paint will dry in the future, so will seems logical: once the paint will be dry. But after once, as after when and if, the present tense talks about the future: once the paint is dry.
As soon as means 'once', with extra stress on 'immediately': Call me as soon as you land. Once means 'when, after that point': Once you've tried it, you'll love it. Once again means 'one more time', not 'one time'.
Your turn
The next action follows drying: Once the floor ___ dry, you can walk on it.
Show the answer
is — After once, the present tense talks about the future: once the floor is dry. Will be is the trap: the future already comes from the main clause.
Write what you'll do as soon as your studies, a renovation or a work project is finished. Start with once.
Once everyone has chosen a role, we can rehearse the opening scene.
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