介詞on表示時間和地點時怎麼用？
The preposition 'on' has many uses in English. This page summarizes the uses of 'on' as a preposition and provides examples for each type of use. Important prepositional phrases with 'on' are used to introduce and connect ideas are also listed with appropriate examples.
在英語中，介詞on有許多種用法。本章內容對介詞on的用法進行了總結，並在每種用法後面附上了例子，另外，介紹了有關on的介詞短語，並在定義後加上恰當的例句。
ON – TIME
表示時間
'On' is used as a preposition in time expressions with specific days of the week. Note: 'on the weekend' is used in American English, but 'at the weekend' or 'at weekends' is used in British English.
介詞on可以用來和每週裏具體的日子連用，來表示時間。注意：on the weekend是美式英語的表達方法，但是英式英語則採用at weekends的用法。
I will see you on Thursday.
我們星期四見面吧。
Peter usually walks to work on Fridays.
皮特總是在週五步行去上班。
ON – PLACES
表示地點
'On' is used flat surfaces both big and small.
on可以表示處於一個或大或小的平面上。
We played football on the field.
我們在操場上踢足球。
The book is on the table over there.
那本書放在桌子上。
'On' is used with planets. The most common usage is 'on earth', but other planets take 'on' as well.
on也可以和星球連用。最常見的表達式on earth，其他的星球也可以和on連用。
You will find a wide variety of life on earth.
地球上的生物種類繁多。
So far, life has not been discovered on Saturn.
目前爲止，土星上還沒有發現生命的存在。
ON – ONTO
相當於onto
Sometimes 'on' is confused with 'onto'. The preposition 'on' indicates that something is already in the position. 'Onto' indicates a movement from one place onto to surface of some type.
有時候，我們會將on和onto弄混。介詞on表示某物已經處於某個位置上。而onto則表示某物從一個地方移動到另一個地方。
The book is on the table. BUT Pete took the book out of his backpack and put it onto the table.
書在桌子上。但是皮特將書從揹包裏拿出來，放在了桌子上。
Could you move those clothes onto the sofa?
你能把這些衣服放到沙發上嗎？
1.ON FOOT
'On foot' is an exception to stating how something moves with 'by'. For example, I went there by boat, by plane or by car. BUT I went there on foot.
on foot是我們用by表示物體移動的一個例外。例如，我乘船/坐飛機/開車去那裏。但也可以說，我步行（on foot）去那裏。
She left her home and went to town on foot.
她離開家，步行去了鎮上。
Jennifer prefers to go shopping on foot.
珍妮弗喜歡步行着去購物。
IMPORTANT PHRASES WITH ON
關於on的重要短語
'On' is used in a number of fixed expressions. These are some of the most common.
on可以用於多種固定表達。下面是一些最常見的。
2.ON BALANCE
'On balance' is used to summarize a situation.
on balance表示對情況進行總結。
On balance, we need to look for new business soon.
總的來說，我們要儘快開展新業務。
We decided that, on balance, it didn't make sense to invest in new product development.
總而言之，我們認爲投資於新產品開發沒有意義。
3.ON CONDITION (THAT)
'On condition' is used to establish something that must be done in order for something else to happen. 'On condition' can be used in place of 'if'.
on condition表示爲了達到某個目的，必須完成某件事，也可以和if互換。
We'll send our daughter to Europe this summer on condition that she gets good grades this semester.
On condition that you finish this assignment, I will let you stay out late on Saturday.
如果你能完成這個任務，週六就可以晚點回來。
4.ON ONE'S OWN
'On one's own' refers to action that is done by yourself.
on one’s own表示獨自完成某件事。
Time doesn't like to spend much time on his own. He'd rather be with people.
時光不獨行，偏愛與人同。
Mary was proud of having paid for her studies on her own.
瑪麗爲自己能夠掙到學費而驕傲。
5.ON THE CONTRARY
'On the contrary' is used to link ideas showing an opposing point of view.
on the contrary表示持相反觀點。
On the contrary, I believe that it will be impossible to succeed in this market.
相反，我覺得在市場取得成功是不可能的。
You might think Wilma is a great employee. On the contrary, she isn't very effective.
你可能認爲威爾瑪是名優秀的員工。剛好相反，她並沒有那麼好。
6.ON THE OTHER HAND
'On the other hand' is used when showing both the positive and the negative aspects of a situation.
On the other hand表示從積極和消極的方面來看待問題。
We'd think there is a lot of potential to the idea. On the other hand, it's certainly a risky proposition.
我們認爲，這個想法具備多種潛能。另一方面，這也確實是一個冒險的提議。
On the other hand, if you don't spend more time on your homework your grades will get worse.
另一方面，如果你不多花點時間在作業上，你的成績會更差。
7.ON THE WAY
'On the way' indicates that something is physically located on the path to somewhere else.
on the way表示某物位於去某地的路上。
'On the way' can also be used in a figurative sense to indicate that something happened during the course of another action.
on the way也可以比喻在做某事是碰巧發生另一件事。
Let's meet at the school on the way to the park.
我們在去往公園那條路上的學校見面吧。
He happened to meet a lot of great people on the way to his success.
在成功的路上，他偶然遇到了許多優秀的人。
8.ON THE WHOLE
'On the whole' is used to summarize an opinion or discussion.
on the whole用來對意見或討論進行總結。
On the whole, I think you will agree that our position in the market is excellent.
總的來說，我覺得你會認同我們在市場上的地位。
On the whole, Jack thinks it's a good idea to hire some new employees.
總的來說，傑克覺得僱些新員工是個好主意。
SPECIAL CASE: ON TIME VS IN TIME
特殊用法：on time和in time
'On time' means that you have arrived somewhere at the agreed upon time. 'In time' indicates that you have done something within the appropriate amount of time.
on time表示你在規定的時間裏到達了某地。In time表示你在一個恰當的時機裏完成了某事。
I arrived at the meeting on time.
我準時出席了會議。
She picked us up at the airport on time.
她準時去機場接我們。
BUT
但是
I finished the report in time for the meeting.
我及時完成了會議的報告。
Janice gave her recommendations in time for us to make an informed decision.
加尼斯及時給她寫了推薦信，使我們能夠做出知情的決策。
