早、午、晚要用 in
例： in the morning在早上
in the afternoon在下午
in the evening在晚上
in the day在白天
at黎明、午、夜、点与分
例: at dawn, at daybreak在黎明时候
at noon在中午
at night在夜间
at midnight在午夜
以上短语都不用冠词
at six o'clock在 6点钟
at 7： 30( seven thirty)在 7点半
at half past eleven在 11点半
at nine fifteen在 9点 15分
at ten thirty a. m. 在上午 10点 30分也可以写成 seven to five 5点差 7分(半小时以上)
five minutes after two 2点过 5分
at a quarter to two 1点 45分
at the weekend在周末
年、月、年月、季节、周
即在“某年”，在“某月”，在“某年某月”(但在某年某月某日则用 on)，在四季，在第几周等都要用 in。
例：
in 1986在 1986年
in 1927在 1927年
in April在四月
in March在三月
in December, 1986 1986年 12月
in July, l 983 1983年 7月
in spring在春季 in summer在夏季
in autumn在秋季 in winter在冬季
in the fist week of this semester这学期的第一周
in the third week在第三周
阳光、灯、影、衣、冒 in，即在阳光下，在灯下，在树阴下，穿衣、着装、冒雨等都要用 in。
例： Don't read in dim light. 切勿在暗淡的灯光下看书。
They are reviewing their lessons in the bright light. 他们在明亮的灯光下复习功课。
They are sitting in the shade of a tree. 他们坐在树阴下乘凉。
a prisoner in irons带着镣铐的囚犯
He went in the rain to meet me at the station. 他冒雨到车站去接我。
The poor dressed (clothed) in rags in old society. 旧社会穷人们衣衫褴褛。
以及： in the bright sunlight在明亮的阳光下
a merchant in disguise乔装的商人
the woman in white( black, red, yellow)穿着白(黑、红、黄)色衣服的妇女
in uniform穿着制服
in mourning穿着丧服
in brown shoes穿着棕色鞋
in his shirt sleeves穿着衬衫
将来时态 in…以后
例: They will come back in 10 days. 他们将 10天以后回来。
I'll come round in a day or two. 我一两天就回来。
We'll be back in no time. 我们一会儿就回来。
Come and see me in two days ' time. 两天后来看我。(从现在开始)
After…(从过去开始)
小处 at大处 in
例： Li and I arrived at Heishan county safe and sound, all is well. Don't worry.
李和我平安地到达黑山县，一切很好，勿念。
I live in a great city( big city), my sister lives at a small town while my parents live at a village. 我住在大城市，我姐姐住在一个小城镇，而我的父母则住在农村。
I'm in Liaoning, at Anshan. 我住在辽宁省鞍山市
有形 with无形 by，语言、单位、材料 in
例： The workers are paving a road with stone. 工人们正用石子铺路。(有形)
The teacher is correcting the paper with a new pen. 这位教师正用一支新笔批改论文。(有形)
“ Taking Tiger Mountain by Strategy” is a good opera. <<智取威虎山>>是—出好戏。(无形)
The product is separated by distillation into gasoline and gas oil. 这种产品是用蒸馏分离出汽油和粗柴油。(表示方式、手段、方法——无形)
I really can't express my idea in English freely in-deed.
我确实不能用英语流利地表达我的思想。(表示某种语言用 in)
I wrote a novel in Russian. 我用俄语写了一本小说。(同上)
The kilometer is the biggest unit of length in the metric system.
公里是米制中最长的长度单位。(表示度、量、衡单位的用 in)
The length is measured in meter, kilometre, and centimetre.
长度是以米、公里、厘米为单位来计算的。(同上)
This board was cast in bronze not in gold. 这个牌匾是铜铸的，不是金铸的。
特征、方面与方式、心情、成语惯用 in
特征或状态：
例: The Democratic Party was then in power. 那时民主党执政。
They found the patient in a coma. 他们发现病人处于昏迷状态。
He has not been in good health for some years. 他几年来身体一直不好。
Many who came in despair went away in hope. 许多人带着绝望情绪而来，却满怀希望而去。
The house was in ruins. 这房屋成了废墟。
The poor girl was in tears. 这个贫苦女孩泪流满面。
Her clothes were in rags. 她的衣服穿破了。
His shoes were in holes. 他的鞋穿出窟窿了。
I only said it in fun. 我说这话只是开玩笑的。
She spoke in grief rather than in anger. 与其说她讲得很气愤，不如说她讲得很伤心。
还有一些短语也用 in，如：
in jest诙谐地， in joke开玩笑地， in spite恶意地， in fairness公正地， in revenge报复, in mercy宽大， in sorrow伤心地等。
His mind was in great confusion. 他脑子里很乱。
Today everybody is in high spirits and no one is in low ebb.
今天大家都兴高采烈，没有一个情绪低落的。
She and her classmates are in flower ages. 她和她的同学都正值妙龄。
The campaign was in full swing. 运动正值高潮中。
方面：
例： We accepted the item in principle. 我们在原则上接受了这个条款。
They are never backward in giving their views. 他们从来不怕发表自己的意见。
The backward area has achieved self-sufficient in grain.
这个落后的地区在粮食方面已能自给。
A good teacher must be an example in study. 一个好的教师必须是学习的模范。
方式：
例： All the speeches were taken down in shorthand. 所有报告都用速记记录下来了。
The Party has always educated us in the spirit of patriotism and internationalism.
党一贯以爱国主义和国际主义精神教育我们。
如下成语惯用 in
例： in all总计
in advance事前
in the meantime与此同时
in place适当地
in hopes of(或 in the hope of)怀着……希望
in connection with和……有关
in contact with和……联系
in addition to除……以外
in case of倘若，万一
in conflict with和……冲突
in force有效的，大批
in depth彻底地
in regard to关于
in the neighborhood of大约、邻近
in retrospect回顾，一想起
in behalf of代表……利益
in the least一点，丝毫
in alarm惊慌、担心
in the opinion of据……见解
in the long run从长远说来
in one's opinion在……看来
in word口头上
in a word总之
in vain无益地,白白地
in case如果，万一，以防
in detail详细地
in haste急急忙忙地
in conclusion总之
in spite of尽管
in other words…换句话说
in return作为回报
in the name of以……名义
be confident in对……有信心
be interested in对……感兴趣
in doubt怀疑
in love恋爱中
in debt负债
in fun( jest、 joke)玩笑地
in hesitation犹豫不决
in wonder在惊奇中
in public (secret)公开他(秘密地)
in a good humour心情(情绪)好
“介词 at、 to表方向，攻击、位置、善恶、分”
介词 at和 to都可以表示方向;用 at表示方向时，侧重于攻击的目标，往往表示恶意;用 to表示方向时，突出运动的位置或动作的对象，侧重表示善意。
试比较下列各句：
1. A.She came at me. 她向我扑过来。
B.She came to me. 她向我走过来。
2. A.Jake ran at John. 杰克向约翰扑过去。
B.Jake ran to John. 杰克朝约翰跑去。
3. A. He rushed at the woman with a sword. 他拿着剑向那妇女扑过去。
B. He rushed to the woman with a sword. 他带着剑向那妇女跑过去。
4. A.He shouted at the old man. 他大声喝斥那老人。
B. He shouted to the old man. 他大声向那老人说。
5. A.I heard her muttering at Xiao Li. 我听见她在抱怨小李。
B.I heard her muttering to Xiao Li. 我听见她在同小李低声说话。
6. A. She talked at you just now. 她刚才还说你坏话呢。
B.She talked to you just now. 她刚才还同你谈话呢
7. A.She threw a bone at the dog. 她用一块骨头砸狗。
B.She threw a bone to the dog. 她把一块骨头扔给狗吃。
8. A.He presented a pistol at me. 他用手枪对着我。
B.He presented a pistol to me. 他赠送我一支手枪。
