Adverb clauses of time are introduced by the subordinating conjunctions when, wherever, before, after, as, since, till, once, now that etc.

• After you have finished your work you can go home.
• Do it before it gets too late.
• As soon he heard the news he wrote to me.
• Don’t talk while the baby is sleeping.
• I have not been feeling well since I returned from Mumbai.
• Just as we entered the room, the clock struck five.

Notes

Once and now that are also sometimes used to introduce adverb clauses of time.

• Once you have made a decision, you must stick to it.
• Now that summer has come, we must buy another fan.

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