英语句子成分分析 Teachers often help their students gain new knowled

英语句子成分分析 Teachers often help their students gain new knowledge.
The skills of a surgeon sometimes mean the difference between life and death.

1,这是个“主语--谓语--宾语--宾语补足语”句型.
主语：Teachers
谓语：help
宾语：their students
宾语补足语：gain new knowledge
2,这是个“主语--谓语--宾语”句型
主语：The skills of a surgeon
谓语：mean
宾语：the difference