我们回来的时候，他们已经在收拾了。
They were already cleaning up when we got back.
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were英 /wɜː/|美 /wər/
already英 /ɔːlˈredi/|美 /ɔlˈrɛdi/
cleaning英 /ˈkliːnɪŋ/|美 /ˈklinɪŋ/
解释
过去进行时 were cleaning 中间插入 already，表示动作在过去的参照点之前已经开始。already 位于 were 和 cleaning 之间的中位。
They were already cleaning up when we got back.
过去进行时 were cleaning 中间插入 already，表示动作在过去的参照点之前已经开始。already 位于 were 和 cleaning 之间的中位。