强调句改变句子结构。强调句突出特定成分。强调句使用“it is...that...”结构。强调句也可以使用“what...is/was...”结构。强调句不改变句子原意。

“it is...that...”结构强调主语。原句“John broke the window.”变“It is John that broke the window.”。强调句在“John”前后加“it is”和“that”。强调句将“John”置于表语位置。

“it is...that...”结构强调宾语。原句“John broke the window.”变“It is the window that John broke.”。强调句移动“the window”到“it is”后。强调句保留“that”和剩余部分。

“it is...that...”结构强调状语。原句“John broke the window yesterday.”变“It was yesterday that John broke the window.”。强调句移动“yesterday”到“was”后。强调句保留“that”和剩余部分。

“it is...that...”结构强调时间状语。强调句强调地点状语。强调句强调原因状语。强调句不强调谓语动词。

“what...is/was...”结构强调主语。原句“I need a pen.”变“What I need is a pen.”。强调句用“what I need”作主语。强调句将“a pen”作表语。

“what...is/was...”结构强调宾语。原句“I like music.”变“What I like is music.”。强调句用“what I like”作主语。强调句将“music”作表语。

“it is...that...”结构中的“that”不能省略。强调句中的“is”或“was”与主语一致。强调句中的“is”或“was”与“that”后谓语无关。

强调句与定语从句不同。定语从句修饰名词。强调句不修饰名词。强调句去掉“it is...that...”后句子完整。定语从句去掉关系词后句子不完整。

强调句的时态变化。强调句使用“is”或“was”。“is”用于现在时态。“was”用于过去时态。强调句不改变原句时态。

强调句的否定形式。强调句在“it is”后加“not”。例如“It is not John that broke the window.”。强调句的疑问形式。强调句将“is”或“was”提前。例如“Is it John that broke the window?”。

强调句的常见错误。错误一：省略“that”。错误二：使用“which”代替“that”。错误三：时态不一致。错误四：强调谓语动词。