not... until直到……才句型三个考点

not... until直到……才的三个考点：

1) The villagers didn’t realize how serious the pollution was until all the fish died in the river.

2) It was not until all the fish died in the river that the villagers realized how serious the pollution was.（强调句）

3) Not until all the fish died in the river did the villagers realize how serious the pollution was.（倒装句）