一 . 注意强调句型的结构 “ It is /was + 被强调部分 + who/ that + 其它部分”，此结构常译为“是……；……正是”。其特点是：去掉强调结构“ It is / was … who / that… ”或经过语序调整后，原句仍成立。如： It was about 600 years ago that the first clock with a face and an hour hand was made. 如果把 It was… that 去掉后，句意仍完整，不缺任何成分，即原句仍成立。 二 . 注意谓语动词的人称和数与所强调的主语的一致性 在强调句型中，当强调主语时，其后的谓语动词应和被强调成分的人称和数保持一致。如： It is the ability to do the job that matters not where you come from or what you are. 强调的主语 the ability to do the job 是单数，因此谓语动词 matter 也应用相应的单数形式 matters 。 三 . 注意 who 和 that 的选用 在强调句型中，若被强调部分是主语，且指人时，可用 who 代替 that ；若被强调部分是宾语，且指人时，可用 whom 代替 that ；但若被强调部分是状语时，则只能用 that ，即使指时间、地点、原因等，也不能用 when ， where 或 because 等替代。如： It was my sister whom I met in the street yesterday. It was only when I reread his poems recently that I began to appreciate their beauty. It was for this reason that her uncle moved out of New York and settled down in a small village. 四 . 注意该句型一般不强调谓语动词 强调句型通常强调主语、宾语和状语，一般不强调谓语。需强调谓语时，要在谓语动词原形前面加上助动词 do ， does 或 did ，尤其是在祈使句或肯定句中，用来加强语气。如： Do tell me where on earth you are now! Boys and girls , let me tell you something that does sound strange. To my surprise, he did come here on time last night. 五 . 注意区分含有 Not until 的倒装结构和强调结构 Not until 用于句首时，主语和谓语通常用倒装语序。如果是复合句，那么主句用倒装语序。但在“ It is / was not until …. that ”句型中， that 后的主谓不倒装。如： It was not until she took off her dark glasses that I realized she was a famous film star. 本句是由 I didn't realize she was a famous film star until she took off her dark glasses 变化而来的。命题者有意将状语从句 until she took off her dark glasses 置于 It was … that 这个强调句型中，考查考生的判断能力。此句还可用倒装结构来表达。如： Not until she took off her dark glasses did I realize she was a famous film star. 六 . 注意强调句型与主语从句“ It is /was… that… ”的区别 主语从句中 It is / was 后通常有名词或形容词作表语，而强调句型中 It is/ was 后是对主语、宾语或状语的强调成分。其判别方法是：去掉强调句式结构或经过语序调整后，原句仍成立。这也是强调句型与主语从句及其它句式的重要区别之一。如： It is a fact that English is being accepted as an international language. Was it during the Second World War that he died?

　　强调句将句子中的it is / was …that同时省去，句子仍然成立；而主语从句将that与后面部分代替it，成立。如： (1) It is Li Lei’s brother that you met in the street yesterday. 你昨天在街上所见到的就是李蕾的兄弟。 本句若将It is 及 that同时省去为：You met Li Lei’s brother in the street yesterday. 句子同样成立，因此前面的句子是强调句型。 (2) It is exciting that we have succeeded in sending up Shenzhou V. 我们成功地发射了神舟五号这件事情真令人兴奋。 本句若将It is 及 that同时省去为：We have succeeded exciting in sending up Shenzhou V. 显然句子错误，因此，前面句子不是强调句型，而是主语从句。

　　it 是形式主语， is said 是谓语动词（被动语态），that 是连接词，连接后面的主语从句

　　强调句将句子中的it is / was …that同时省去，句子仍然成立；而主语从句将that与后面部分代替it，成立。如： (1) It is Li Lei’s brother that you met in the street yesterday. 你昨天在街上所见到的就是李蕾的兄弟。 本句若将It is 及 that同时省去为：You met Li Lei’s brother in the street yesterday. 句子同样成立，因此前面的句子是强调句型。 (2) It is exciting that we have succeeded in sending up Shenzhou V. 我们成功地发射了神舟五号这件事情真令人兴奋。 本句若将It is 及 that同时省去为：We have succeeded exciting in sending up Shenzhou V. 显然句子错误，因此，前面句子不是强调句型，而是主语从句。

　　it 是形式主语， is said 是谓语动词（被动语态），that 是连接词，连接后面的主语从句

　　it 是形式主语， is said 是谓语动词（被动语态），that 是连接词，连接后面的主语从句，从句是真正的主语，从句中的句子成分是这样的：no passengers 是从句中的主语，were infured 是从句的谓语动词，in the accident 是从句中的状语。