他把衣服洗得完。→ 他把衣服洗完了。 The structure “A 把 B + V + Complement of Result” can be used to indicate an action which is done on a definite person or thing and has brought a result to the person or thing. “完了” in this sentence is a complement of result meaning "finished". 他们都是老师们。 → 他们都是老师。 "们" indicates plurals, usually used after people. And "XXX们" generally used as subject, or address. 爸爸看了小说两小时。 → 爸爸看了两个小时小说。 “Subject + Verb + 了 + Duration + Object” indicates the duration of an action. In your sentence, "看" is the verb, "小说" is the object, and "两个小时" is the duration. 学生回去家了。 → 学生回家去了。 A directional verb, “上、下、进、出、回、过、起”, etc., followed by a simple complement of direction, “来” or “去”, can be used after another verb as its complement, that is, a compound complement of direction that indicates the direction of the action and describes the action in detail. When the object is a place, it should be put before “来/去”. 书店是银行左边。 → 书店在银行左边。 When introducing the position of a thing, the commonly used sentence pattern is: "A 在 B + localizer."

他把衣服洗得完。- Because Chinese doesn't have “ tense” （时态），this sentence is confusing. You have 2 options. 1. 他得把衣服洗完。He has to get clothes washed. 2. 他能把衣服都洗完。He is able to finish washing all the clothes. So, it depends on what you are trying to say. 他们都是老师们。- 他们都是老师。(Because 老师 here is profession. ) 爸爸看了小说两小时。-爸爸看了两个小时小说。（语序问题） 学生回去家了。-学生回家了。（回家 is a fixed phrase） 书店是银行左边。-书店在银行的左边。