【1】“助动词be”+“过去分词(done)”是构成“被动语态的基本结构”,如果细分的话,“限定性动词(be)”+“非限定性动词(be)”一起用来充当“句子谓语动词”
Three apples on the table were eaten by Tom yesterday.
桌上的三个苹果昨天被汤姆吃了。
【2】I have always tried to help in need. 这个句子最好改为
I have always tried to help people in need.
备注:in need为介词短语意思“在困境中,在危难中,在危急中”作后置定语时被修饰名词为“表示事物名词或者表示人的名词/代词”不能为“抽象名词”
The education authorities have to provide for children in need. 教育主管部门得救助贫困儿童。
Alms were distributed to those in need. 救济品被分发给困难人群。
A friend in need is a friend in deed. 患难见真情.