Question

用所给动词的适当形式填空

1.---I won't go to bed until the TV play ____(be) over.
---You'd better not do that.
2.I ____(write) him a second letter before I heard from him.

Answer 1

1.---I won't go to bed until the TV play is (be) over.
---You'd better not do that.主句是一般将来时态，（until引导的）时间状语从句
要用一般现在时代替一般将来时。2.I had written (write) him a second letter before I heard from him.在过去某一动作（I heard from him）之前已经发生或完成的动作，要用过去完成时态。

Answer 2

1.is主句将来时，从句一般现在时。
2.had written收到他信之前已经写了第二封信给他。
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Answer 3

1.is主句将来时，从句一般现在时。
2.had written收到他信之前已经写了信，是过去完成时。

Answer 4

1，is 主句一般将来时，从句现在时
2，had written 从before I heard from中heard用的过去式看出，我给他写信发生在过去的过去，应用过去完成时