冀教版第五册句型归纳总结，可供中考复习用。

8. Before her illness, Helen had been a bright and happy girl.在她生病之前，海伦是一个聪明幸福的女孩。

【解析】before her illness是介词短语，意为“在生病之前”，在句中作状语。我们可以用时间状语从句Before she was ill替换它。如：

She has taught in this school before leaving for Shanghai. = She has taught in this school before she left for Shanghai. 她在去上海之前在这所学校教书。

【归纳·拓展】

类似这种介词短语和从句之间的替换情况，常见的还有：

①She didn’t come to school because of illness.