—When（） you （）the army?In 1978.Since I （）17 years old

—When（） you （）the army?In 1978.Since I （）17 years old He ___ the army when he was eighteen years old.A took part i John joined the army three years ago.(用since或for改写） 怎么写. Four years()since I ()the army 求分析 ____ four years since I joined the Army. my brother is 16 years old,he can"tjoin the army ( 同义句） I （）（live）here since I was five years old .帮我哦 It is three years since I joined the army.改成完成时态 I ____four years since I joined the army.A.There was B.There i It has been 5 years since I was away from the army,but now I 1.His father __ the army when he was eighteen years old.. 改为同义句：They joined the army when they were 18 years old .