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."

It’s correct, but not common expression. It would be better like this: 我是护士，在医院工作。 我是老师，在学校工作。

我对运动不太感兴趣。✔️ 可是我知道为了健康，人们都需要锻炼身体。✔️ 所以我选择了一种最简单的运动，就是散步。✔️ 依我看，✔️ 散步不但是很简单， 散步不但很简单 “简单”是形容词，不需要“是” 并且是对身体和精神最好的运动。✔️ 散步不导致膝盖疼，不让身体很累。 散步不会导致膝盖疼，也不会让身体很累。 When we want to emphasize that something or some action will not bring us some disadvantages, we often add "不会" before the disadvantages. 我天天都散步10公里左右。✔️ 这让我身体很舒服。✔️

Mary was in Tina's house when Tina's friend called her. Tina的朋友给她打电话的时候，Mary在Tina的家。 ① In Chinese, the clause start with "when" can be used as "······ 的时候". And we always put "······的时候" in the beginning of a sentence as it is a time. ② the difference between "给" & “跟” A给B打电话：A calls B, emphasize A dials B's number, B may not have answered the phone A跟B打电话：emphasize A is talking with B on the phone