Ask the students to make up sentences using the adverbial clause of condition with if.
要求学生使用 if 来组成条件状语从句。
2
When the if clause has more than one condition, you can choose to have it evaluate to true when any of the conditions are true or when all of the conditions are true.
当 if 子句有多个条件时，您可以选择让它在任何条件为 true 时求值为 true，或者在所有条件都为 true 时才求值为 true。
3
Each clause can have certain actions to be performed by the probe, upon satisfying the predicate condition.