Curated OER
Possibility / Impossibility in the Past
In this possibility/impossibility in the past tense worksheet, students read for information and use could have and couldn't have to practice usage and logical reasoning. Students write fourteen answers.
Curated OER
Word Usage: Could Have / Couldn't Have
In this word usage learning exercise, students must determine whether to use 'could have' or couldn't have' to fill in the blanks in sentences.