介词“in”的用法1: 年、月、年月、季节、周即在"来年"，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 l983 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2: 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3: 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)4: 有形with无形by，语言、单位、材料in例：The workers are paving a road ______ 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)I wrote a novel in Russian. 我用俄语写了一本小说。
The length is measured in meter, kilometre, and centimeter=_________________ 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。
5: 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。
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. 她的衣跟穿破了。
She spoke in grief rather than in ange r. 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。
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 ____ flower ages. 她和她的同学都正值妙龄。
如下成语惯用inin all _______in the meantime 与此同时=_______________in place 适当地in hopes of(或in _____ 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 _____ of 倘若，万一in_______ with 和......冲突in force 有效的，大批in depth 彻底地;________in regard to _________in the neighborhood of 大约、邻近in the least 一点，丝毫in alarm 惊慌、担心in the opinion of 据……见解=_________in the long run ________in one's opinion 在……看来in word 口头上 / in a word______ in vain ________in case 如果，万一，以防in _______ 详细地in conclusion 总之in spite of =________in other words... 换句话说in return _________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_____sb 负债in fun (jest、joke) 玩笑地in hesitation _in wonder 在惊奇中in public (secret) 公开他(秘密地) in a good humour 心情(情绪)好in _____ of 就某事来说in______ of负责in ______of 纪念in_______ of寻找in_______of需要in_______of支持in_______of代替in_______of支持in_______of称赞in_____hurryin______ sensein______wayin fashionin_____ same way_____ advance_____addition toIn the air____________ briefIn______ with相同In conclusion_______In connection_____In_________ conditionIndspair______In_____ distanceIn the course of___________ trouble____ fact= as___ matter of factIn _____ form ofIn ____ future____general____ itself本身Be in ____ habit of doing sth ____ lineIn the _____/______ run 长远来说In _____ messIn______本质上In_____ moment立刻____ one’s opinionIn spite of_______in stock________in_______秘密的/________公开的in _______流泪in_________尤其是，特别是in _______秩序井然in practice_______in turn______/inreturn_________in_____pastin person________in principle__________in_____place ofin _____ first place=at firstin ____search ofbe in ____ touch/contact within time____/______in____ company of伴随着in this regard______in total_______in _____wordin other words___________in _______extreme极其动词+in:Call inTake inHave difficulty in doing sthDo well inBe lost inBe interested inGive in to sbJoin inTake part inMajor inPull inArrive inConsist in: Happiness consists in contentment.Deal in :He deals in hardware rather than software.End inLie inResult inSucceed in doing sthPlay a role inBe active inTurn inBe set inBe employed inBe buried in Get involved in Break in/into Bring inDrop in ___/_____ Fill in。