1B 部分翻译
Using when,while and as
使用when，while和as
When,while and as can be used as coniunctions of time They all mean "during the time that".
when，while和as可以被用作时间连词。它们的意思都是“在那段时间里”。
I was sleeping when the earthquake started.
当地震发生时我正在睡觉。
People were running in all directions while pieces of glass and bricks were falling down.
当玻璃碎片和砖块掉落的时候，人们正向四面八方跑。
As I was trying to find my way out,I suddenly heard some noise above me.
当我正努力找出路时，我突然听到我上面的一些噪音。
Note:When a shorter action happened at the same time as a jonger action,we use the past continuous tense for the longer action and the simple past tense for the shorter action When there are two long actions,we often use while.
注意：当短暂的动作和稍长的动作同时发生时，我们用过去进行时表示稍长的动作，用一般过去时表示短暂的动作。当有两个长的动作时，我们常用while。
If the shorter acrion is in the main clause,we can use when,while or as to join them.
如果短暂的动作在主句中，我们可以用when，while或as来连接它们。
When/While/As Millie was watching TV,Andy came into the room.
当米莉看电视的时候，安迪走进了房间。
If the longer action is in the main clause,we often use when to join them.
如果稍长的动作在主句中，我们经常用when来连接它们。
Millie was watching TV when Andy came into the room.
当安迪进入房间的时候，米莉正在看电视。
TIP:We use a comma to separate the two clauses if when,while or as comes at the beginning of the sentence.
窍门：如果when，while或as位于句首的时候，我们用逗号把两个分句分开。
When the earthquake started, most people were sleeping.
当地震发生时，大多数人正在睡觉。
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