ask for 请求；向…要 要求（见） 招惹；自找（麻烦）
The workers are asking for an increase in pay．工人在请求增加工资。
She asked for time to think all this over．她要求给她时间把这一切仔细想一想。
Here's a gentleman asking for the manager．这里有位先生要求见经理。
He is foolish to behave in that way；he is asking for trouble．他那样做是愚蠢的，是自找麻烦。
She had been teasing the dog for weeks， and I'm not surprised it bit her—she certainly asked for it ．她好几个星期一直在逗弄那条狗，那狗咬了她并不奇怪，这是自作自受。
ask of 向…询问；请求
I would like to ask a favour of you．我想请你帮个忙。
It's not too much to ask of you to wash your own clothes．请你把自己的衣服洗一下，这要求并不过份。
ask off 请假
You are not allowed to ask off．不准你请假。
assent to agree to 同意；赞同（正式）
The Queen assented to the new law．女王赞同新的法律。
Our teacher will never assent to our playing football in the street．老师决不会同意我们在街上踢足球。
The committee assented to our proposals．委员会同意了我们的提议。
assign to 委派；指派 分配；把…分给
Soon they assigned him to a new post．不久他们把他派到一个新的岗位上去。
He has been assigned to an important post．他已被委派到一个重要的岗位。
The defence of the oil installation had been assigned to my regiment．我团被指派守卫该石油设施。
The room is assigned to Mr．Wang．这个房间是分给王先生的。
assist in help with在…方面帮助
She is very grateful to her husband，who assisted in preparing the book．她非常感激自己的丈夫，因为正是在他的帮助下，这本书才得以问世。
associate with 把…与…联系起来；联想
I always associate the smell of these flowers with my childhood．闻到这些花香，我就会联想到童年时代。
We naturally associate the name of Darwin with the doctrine of evolution．我们很自然地把达尔文的名字与进化论联系在一起。
associate with keep company with与…交往；与…合作
He won't have his son associate with dishonest boys．他不准儿子同不诚实的男孩交往。
They are ready to associate themselves with us in an enterprise．他们乐于跟我们合作办企业。
assure of 使…放心；使…确信；向…保证
He assured me of his final success．他使我确信，最后他会取得成功的。
I can assure you of my full support for your plan．我向你保证，一定全力支持你的计划。
The doctor assured the young father of his baby's safety．医生肯定地向这位年轻的父亲说孩子的病是能治好的。
at（one's）leisure 在空余之时
I am quite at leisure if you want me to do anything for you．你要是需要我帮忙，我完全有空。
Please look through the manuscript at you leisure．请在闲暇的时候把这份稿子看一下。
at （the） best. at the maximum至多
at best， they can cover only half the journey this week．他们这个星期至多只能走完一半的路程。
at （the） best. 充其量
I can give you one hundred dollars at best．我充其量只能给你一百美元。
at （the）latest，最迟；至迟
We must be there by ten at （the）latest．我们必须最迟十点钟赶到那里。
In a few days at （the）latest I will return．我最多几天就返回。
I will give you a definite answer on Friday at the latest．我最迟在星期五给你确切的答复。
at （the）most至多
He is at most thirty years old．他至多三十岁。
It was a minor offense at most．那顶多也不过是个小错。
at （the）worst 坏到极点；作为最坏的可能性
We'll lose some money at worst．我们至多损失一些钱罢了。
She keeps cheerful，even when things are at their worst．即使在最糟的情况下，她也保持心情愉快。
at the point of . on the point of . upon the point of 正在…之时；就在…之际
He told his son the secret at the point of death．他在临死前把秘密告诉了儿子。
I was on the point of asking who he was， when he told me his name．我正要问他是谁时，他把他的名字告诉了我。
at sight . on sight 一见（就）
He shot the enemy officer at sight．他一看见那个敌军官就把他击毙了。
at a word. . at one word
The doctor must be sent for at a word．必须马上去请医生。
at a disadvantage. 处境不利
He could not speak English two years ago，which put him at a disadvantage in America． 他两年前不会说英语，这使他当时在美国处于不利地位。