Which of the following sentence is grammatically correct?
1. Wait for the right time until the experiments are done.
2. Wait for the right time until the experiments will be done.
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The first sentence is correct. "Until" cannot be followed by the future tense, you should use the present form of the verb in order to refer to the future events.
"Until as a conjunction" according to Cambridge Dictionary:
We use present verb forms to refer to the future after until:
- I can’t wait until the summer holidays begin.