但是独立主格结构转换为状语从句后,它有自己的逻辑主语,与主句的主语不一致;
而分词短语转换为状语从句后,从句的主语与主句的主语一致。
If time permits, we'd better have a holiday at weekends.(条件状语从句)
Time permitting, we'd better have a holiday at weekends.(独立主格)
When we see from the hilltop, we can find the city more beautiful.(时间状语从句)
Seeing from the hilltop, we can find the city more beautiful.(现在分词)