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众所周知，be＋动词的现在分词构成了英语中的进行时态，表示在过去、现在或将来某一时刻或某段时间正在发生或进行的动作。除此之外，一些含on的詞组也可以表示正在发生的动作或持续的状态这一意义。
一、on＋名词
1．on fire起火，着火
The house was on fire.房子着火了。
相当于：The house was burning.
2．on duty值班，执勤
Two soldiers are on duty guarding thegate.两个士兵正在门口执勤。
相当于：Two soldiers are doing theirjob.guarding the gate.
3．on holiday在度假
His parents are on holiday in California.他的父母亲正在加利福尼亚度假。
相当于：His parents are spending theirholidays in California.
4．on parade在游行
Shouting slogans,the workers were onparade.工人们正高呼着口号，进行游行。
相当于：Shouting slogans,the workerswere holding a parade.
5．on(active)service＝in(active)set-vice在服现役
My uncle was on active service duringthe War of Resistance Against Japan.抗日战争时期我伯父在部队里当兵。
相当于：My uncle was serving in the ar-my during the War of Resistance Against Ja-pan.
此类词组还有on leave，on vacation，onstrike等。
二、on＋the＋名词
1．on the wing在飞行
John shot the eagle while it was on thewing.约翰是在苍鹰正在天空中飞翔时把它射下来的。
相当于：John shot the eagle while it'wasflying.
2．on the warpath反对，阻止
The police are on the warpath againstspeeders.警察极力阻止司机开快车。
相当于：The police are trying to stopdrivers from driving too fast.
3．on the track尾随，跟踪
The hunter is on the track of a deer.猎人正在追赶着鹿。
相当于：The hunter is following a deerin order to shoot it.
4．on the anvil在讨论中
It was on the anvil at the meeting yes-terday.昨天会议上在讨论这事。
相当于：It was being discussed at themeeting yesterday.
这一类词组还有on the fire,0n the car-pet,on the trail等，它们往往具有比喻或象征等修饰手法的特点。
三、on＋the＋动词转化成的名词
1．on the mend(病情或事态)在好转中
Mary's relationship with Joan is on themend.玛丽和琼的关系正在好转。
相当于：Mary and Joan had a disagree-ment,but their relationship is getting betternow.
2．on the boil正在沸腾
The kettle was on the boil when I cameinto the kitchen.我走进灶间时，水正在滚着。
相当于：The water in the kettle wasboiling when I came into the kitchen.
3．on the move在运动
Large,black clouds on the move an-nounced a coming storm.大堆的乌云正在翻滚，看来一场暴风雨要来临了。
相当于：Large,black moving clouds an-nounced a coming storm.
4．onthe run在跑
The enemy soldiers were on the run.敌兵正在逃跑。
相当于：The enemy soldiers were retreating.
5．on the increase在增加
The technical cooperation and culturalexchanges between the two countries are onthe increase daily.两国之间的技术合作和文化交流正在与日俱增。
相当于：The technical cooperation andcultural exchanges between the two coun-tries are Increasing.
6．on the lookout注视着
The little boy was on the lookout for hisfather.小男孩正在仔细观察着他的父亲。
相当于：The little boy was watching hisfather closely.
这一类on词组有如下几个特点：
1．on后的宾语都是由动词转化成的名词。
2．宾语都带有定冠词the。
3．原来的动词通常是不及物动词。
4．这一类词组往往含有该动词的现在分词的意义。
除以上所举的例子外，还有：on themarc,on the flow,on the go,on the fly,on the decline,on the decrease,on the ebb等。含on词组这一结构虽在一般的语法书中很少提及，但它所表示的进行意义却是十分明显的。同时，从上述例句中我们不难看出，它们只有在句中充当后置定语或表语时，才有这种含义。另外，我们还要注意这种结构与它们作时间(如on January 17th)、地点(on the desk)、目的(on business)、方向(onthe right)等状语时的区别，前者一般是固定词组，后者则是灵活搭配，不可混为一谈。
一、on＋名词
1．on fire起火，着火
The house was on fire.房子着火了。
相当于：The house was burning.
2．on duty值班，执勤
Two soldiers are on duty guarding thegate.两个士兵正在门口执勤。
相当于：Two soldiers are doing theirjob.guarding the gate.
3．on holiday在度假
His parents are on holiday in California.他的父母亲正在加利福尼亚度假。
相当于：His parents are spending theirholidays in California.
4．on parade在游行
Shouting slogans,the workers were onparade.工人们正高呼着口号，进行游行。
相当于：Shouting slogans,the workerswere holding a parade.
5．on(active)service＝in(active)set-vice在服现役
My uncle was on active service duringthe War of Resistance Against Japan.抗日战争时期我伯父在部队里当兵。
相当于：My uncle was serving in the ar-my during the War of Resistance Against Ja-pan.
此类词组还有on leave，on vacation，onstrike等。
二、on＋the＋名词
1．on the wing在飞行
John shot the eagle while it was on thewing.约翰是在苍鹰正在天空中飞翔时把它射下来的。
相当于：John shot the eagle while it'wasflying.
2．on the warpath反对，阻止
The police are on the warpath againstspeeders.警察极力阻止司机开快车。
相当于：The police are trying to stopdrivers from driving too fast.
3．on the track尾随，跟踪
The hunter is on the track of a deer.猎人正在追赶着鹿。
相当于：The hunter is following a deerin order to shoot it.
4．on the anvil在讨论中
It was on the anvil at the meeting yes-terday.昨天会议上在讨论这事。
相当于：It was being discussed at themeeting yesterday.
这一类词组还有on the fire,0n the car-pet,on the trail等，它们往往具有比喻或象征等修饰手法的特点。
三、on＋the＋动词转化成的名词
1．on the mend(病情或事态)在好转中
Mary's relationship with Joan is on themend.玛丽和琼的关系正在好转。
相当于：Mary and Joan had a disagree-ment,but their relationship is getting betternow.
2．on the boil正在沸腾
The kettle was on the boil when I cameinto the kitchen.我走进灶间时，水正在滚着。
相当于：The water in the kettle wasboiling when I came into the kitchen.
3．on the move在运动
Large,black clouds on the move an-nounced a coming storm.大堆的乌云正在翻滚，看来一场暴风雨要来临了。
相当于：Large,black moving clouds an-nounced a coming storm.
4．onthe run在跑
The enemy soldiers were on the run.敌兵正在逃跑。
相当于：The enemy soldiers were retreating.
5．on the increase在增加
The technical cooperation and culturalexchanges between the two countries are onthe increase daily.两国之间的技术合作和文化交流正在与日俱增。
相当于：The technical cooperation andcultural exchanges between the two coun-tries are Increasing.
6．on the lookout注视着
The little boy was on the lookout for hisfather.小男孩正在仔细观察着他的父亲。
相当于：The little boy was watching hisfather closely.
这一类on词组有如下几个特点：
1．on后的宾语都是由动词转化成的名词。
2．宾语都带有定冠词the。
3．原来的动词通常是不及物动词。
4．这一类词组往往含有该动词的现在分词的意义。
除以上所举的例子外，还有：on themarc,on the flow,on the go,on the fly,on the decline,on the decrease,on the ebb等。含on词组这一结构虽在一般的语法书中很少提及，但它所表示的进行意义却是十分明显的。同时，从上述例句中我们不难看出，它们只有在句中充当后置定语或表语时，才有这种含义。另外，我们还要注意这种结构与它们作时间(如on January 17th)、地点(on the desk)、目的(on business)、方向(onthe right)等状语时的区别，前者一般是固定词组，后者则是灵活搭配，不可混为一谈。