លេខ 4ចម្លើយខ្លីWhat had you been doing when the power went out in the past perfect continuous tense?Reading
លេខ 7ចម្លើយខ្លីWhat had the team accomplished by the end of the season in the past perfect tense?Championship
លេខ 10ចម្លើយខ្លីWhich famous scientist developed the theory of relativity in the past simple tense?Einstein