I member a very superior young man who found three little girls extremely tiresome to deal with.
疑问：常常看到如此句尾一个动介词组（动词+介词），请问它后面不是必须要加成分么？
▲你的句子中的 member 是否有拼写笔误，是不是是 remember?
句中的extremely tiresome to deal with 用作后置定语，修饰名词 girls，等于定语从句：who are extremely tiresome to deal with.
全句意思：我记得有一位很出色的青年，他发现有三个小姑娘，要应对她们确实非常烦。
▲句末的“动词+介词”到底需不需要接成分（你说的这个成分其实就是指介词的宾语），要看具体状况：
◎若句末的“动词+介词”与前面的某个成分构成语法上的动宾关系，则这个句末介词不可以再加宾语。如：
He is difficult to deal with.他非常难交际。
He’s very easy to get on with. 他容易相处。
She’s great fun to be with. 同她在一块非常有意思。
He’s a tricky fellow to do business with. 他诡计多端，不好与他做业务。
I need a spoon to eat this ice-cream with. 我需要一个匙子来吃冰激凌。
The baby is too much for her to cope with. 小孩太麻烦她很难应对。
I must go at once, but I have no one to leave the baby with. 我得立刻走，但我找不到人照顾我的小孩。
He’s tough to work with.=It’s tough to work with him.=It’s tough working with him.=He’s a tough person to work with. 他是个很难共事的人。
◎不然就要加宾语。如：
They would not cooperate with him. 他们不愿与他合作。
Hard work does not agree with him. 艰苦的工作对他不适合。
I do not approve of your going out with him. 我不赞成你同他一块出去。
Perhaps he will sell his house more cheaply if you bargain with him. 你若是同他讨价还价，或许他的房屋会卖得实惠些。
◎注意：有个别固定短语，它虽然与前面的成分没动宾关系，但也不后接宾语。如：
The club had only six members to start with. 这个会所开始时只有6个人。
To begin with, I do not like its colour. 第一，我不喜欢它的颜色。
We can’t go. To begin with, it’s too cold. Besides,we’ve no money. 大家不去了，第一是太冷了，另外大家又没钱。
