... Topic1: THE INVIRONMENT PERIOD 3: REVIEW ON TENSES - ADVERB CLAUSES OF REASON A.Revision: 1. Tenses: Past simple - Past progressive Past simple Past progressive ... While + S +V2, S+ was/were +V-ing - While + S + was/were +V-ing, S+ was/were +V-ing 2. Adverb clauses of reason: Mệnh đề trạng ngữ chỉ lí do bắt đầu các liên từ because / as / since (vì, bởi vì) ... correct form of the verbs in the blankets: 1. My brother (join) ………………the army when he (be) ……………………young. 2. Tom (study) ……………………chemistry for three years and then he gave it up. 3. Miss Lee often...