高级条件句

高级条件句结构用正式的替代词（provided that、unless、as long as、on condition that）替换 "if"，或使用倒装（inversion），从而为条件意义增添精确性和正式性。

Examples

• You may leave early, provided that you finish the report.
• Unless the weather improves, the event will be cancelled.
• As long as you follow the instructions, you'll be fine.
• The loan was approved on condition that it be repaid within a year.
• Were it not for her help, the project would have failed.

Common Mistakes

Practice

Mini Quiz