We often went on class outings together. The most interesting outing we went on was to a crocodile farm.
在该句里 went on,class outings的意思是？
网友是不是还记得这类词组：go on a trip（去旅游），go on a holiday（去度假），go on an outing（去郊游），go on a diet（节食）？
在这类词组中，go on 表示“从事于；进行”（go 是不及物动词，on 是介词），后面接的是一些“平时活动”，假如指“一次活动”就用单数，假如指“多次活动”，就用复数。
网友这句话的意思：
We often went on class outings together.
大家常常一块全班去郊游。
在英语中，“go on a +单数名词”的使用方法十分容易见到。原来，这个英语的一个习语，意为从事某种活动。容易见到的搭配如下（有时冠词可省略，需要复数加s）：
1. go on a holiday
Id love to go on a holiday but I cant afford the time.我倒想去度假,可是抽不出时间来。
I went on a holiday to China last week.上周我休假去中国旅游。
What fun it will be when we all go on holiday together.大家大伙一块去度假那可太有意思了。
If you save some money each week, we can go on holiday. 如果你每星期能存点儿钱，咱们就能外出度假了。
2. go on a trip
As the day was fine, they decided to go on a trip.因为天气好,他们决定作一次短途旅游
We went on a trip to the mountains.大家到山里去旅游了。
She told me that she would go on trip to Europe the next day.她告诉我,她第二天要去欧洲旅游。
Twenty students of our class, including two American students, went on trip.我班二十个学生，包含二位美国学生，去旅游了。
3. go on a tour
We are going on a tour of the city this afternoon.大家今天下午要到城里去观光。
He went on a tour round the world.他周游了世界。
Do you see about all the necessary things to go on tour?你们负责旅游中所有些事情吗？
The band has gone on tour to promote their new album.这个乐队已开始巡回宣传他们的新唱片。
4. go on a vacation
He never goes on a vacation but he takes his pet dog. 他每次度假都会带他的狗去。
He mopped up the rest of his business and went on a vacation.他办完了剩余的事情就去度假了。
Where would you like to go on vacation, Sam?萨姆,你想到哪儿去度假?
Im looking for someone I can go on vacation with.我在找一个能和我一块去度假的人。
5. go on a diet
The doctor says Ive got to go on a diet. 大夫说我得节食。
He is on a diet to reduce some weight. 他正在节食以减轻体重。
More and more people, especially females, are to go on diet.愈加多的人, 尤其是女孩, 开始节制饮食。
You dont need to go on diet. But you cant overeat and should eat limitedly.你不必节食，但要饮食有度，不可以吃得过饱。
6. go on a strike
The workers go on strike to ask for higher pay.为了提升薪资，工大家举行了罢工。
Over a thousand factory employees went on strike.上千工厂的工人罢工了。
The miners were determined to go on a strike for better working conditions.煤矿工大家决定为争取更好的工作条件举行罢工。
The workers acted out their dissatisfaction with the management by going on a strike.工大家以罢工来表示他们对资方的不满。
7. go on a hike
We took advantage of the fine weather to go on a hike. 大家借助晴朗的天气去旅游。
How would you like to go on a hike with me?和我一块去徒步旅游，如何?
8. go on a journey
He made a resolve to go on a journey early in the next morning.他决意明天一早就动身。
He went on a journey when he was 18 years old, never to come back.他十八岁时出外旅游，一直没回来。
9. go on a voyage
Captain Cook went on a voyage round the world.库克船长做了一次环球航旅游。
How pleasant it is to go on a voyage on the calm sea.在平静的海面上航行多么让人愉快啊!
10. go on an excursion
Weather permitting, well go on an excursion to the Western Hills tomorrow.天气如果适合,大家明天将去西山去玩。
I went on an excursion recently,but my trip took me longer than I expected.近期我作作一次短途旅游，但旅途所花费的时间比我预计的要长。
11. go on an expedition
The scientists will go on an expedition to the South Pole.这类科学家们将要去南极考察。
Three of us will go on an expedition and find out.大家三个先去摸摸底，把事情弄了解。
12. go on an outing
Ill go on an outing with some friends.我与朋友去郊游。
We went on an outing to the seaside.大家去海边旅游。
13. go on an errand
My mother asked me to go on an errand; she wanted me to buy some food.我母亲叫我跑一下腿，她想让我去买点食物。
I want you to go on an errand for me.俺要你去给俺送个信儿。
8. go on a picnic
We will play sports or go on a picnic.大家将做户外运动或去野餐。
They refused to go on a picnic on such a dirty day.他们拒绝在这种恶劣的天气去野餐。
除此之外，go on business中，business是不可数名词，之前不加任何冠词。比如：
I will go on business either this week or next week.
我将在这星期或下星期出差。
John placed aside his writing for a month while he went on business.出差期间，约翰一个月没写东西。
