请注意观察下面第一个句子中的分词和第二个句子中的从句的不同表达方式。

“Mommy, look!”Cried my daughter, Darla, ________(point)to a hawk ________(soar)through the air．

“Mommy, look!”Cried my daughter, Darla, who ________(point)to a hawk which ________(soar)through the air．

请注意观察下面第一个句子中的分词和第二个句子中的从句的不同表达方式。

…an earthquake almost flattened America, ________(kill)over 30,000 people…

…an earthquake almost flattened America, which ________(kill)over 30,000 people…

请注意观察下面第一个句子中的分词和第二个句子中的从句的不同表达方式。

________(remember)his son's classroom would be in the back right corner of the building, he rushed there and started digging through the ruins．

When he ________(remember)his son's classroom would be in the back right corner of the building, he rushed there and started digging through the ruins．

请注意观察下面第一个句子中的分词和第二个句子中的从句的不同表达方式。

As he was digging, other helpless parents arrived, clutching their hearts, ________(say),“My son!”

As he was digging, other helpless parents arrived, clutching their hearts, and ________(say),“My son!”

as if和as though引导的从句所叙述的情况与事实相反时，从句的谓语动词多用虚拟语气。在虚拟语气结构中，用________时态来表示现在的情形；用________时来表示过去的动作或状态；用________时表示正在进行的动作；用________时表示将要发生的动作。

当as if和as though从句的主语和主句主语一致，且从句中含有系动词be的某种形式时该主语和系动词可以省略。

例如：John paused as if(he was)expecting Mary to speak．