We were about to start when he arrived.
他到的时候，我们正要出发。
We were about to start, when it rained.
我们正要开始，就下上雨了。
We were about to start when it began to rain.
我们正要出发，这时天开始下雨了。
We were about to start when it began to rain.
我们刚要出发，天就开始下雨了。
We were about to start out when it began to rain heavily.
我们正要启程，就在这时，天下起了大雨。
We were about to start out when the headmaster stopped us.
我们正要出发，就在这时校长拦住了我们。
The car must break out just when we were about to start off.
就在我们准备出发的时候，车竟然坏了。
The car must break down just when we were about to start off.
我们正要出发的时候偏偏车坏了。
The car must break down just when we were about to start off.
我们正要出发时偏偏车又坏了。
We were about to start, when a strong wind came up and it began to rain.
我们正要出发，这时刮起了大风并开始下起雨来。
We were about to start, when a strong wind came up and it began to rain.
我们正要出发，这时刮起了大风并开始下起雨来。
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