等…再 / 等…以后【děng … zài / děng … yǐhòu】

等 + an event sets a future point: "once", "when". The main clause follows, and 再 before its verb says the action is being held back until then – not now, later.

以后 or 了 often closes the 等 clause and changes nothing in the meaning. 等到 is a fuller form of 等.

再 or 就

再 is putting off: don't do it until then. 就 is readiness: as soon as that happens, it'll be done.

Where 再 goes

再 is an adverb: it goes after the subject of the main clause, right before the verb.

• × 等你回来，再我们吃饭 → 等你回来，我们再吃饭

A future "when"

English "when" covers both past and future. For a future point you are waiting for, 等 is the natural word; 的时候 describes the moment itself rather than waiting for it.

• × 你到了的时候再给我打电话 → 等你到了再给我打电话

For the plain order of two steps, "first this, then that", 先…再 is the frame.