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Preposition At/in/on: They're all expert at/in/on this field



 
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Preposition At/in/on: They're all expert at/in/on this field #1 (permalink) Mon Sep 04, 2006 4:43 am   Preposition At/in/on: They're all expert at/in/on this field
 

Dear teachers,

Please read:

1. They're all expert at/in/on this field.
2. He's expert at/in/on making cheap.

Do you choose "at", "in" or "on" for each sentence? For each sentence, all are possible and interchangeable? If not, how to distinguish when using "at", when using "in" , when using "on"?

Quoc
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How to use English prepositions #2 (permalink) Wed Sep 06, 2006 7:40 am   How to use English prepositions
 

.
One short, simplistic answer:

At a skill
In a field
On a topic
.
.
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How to use English prepositions #3 (permalink) Thu Sep 07, 2006 5:43 am   How to use English prepositions
 

Thanks Sir,

But what does "one short" mean? It's an expression?

Quoc
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Short and simplistic #4 (permalink) Thu Sep 07, 2006 9:41 am   Short and simplistic
 

Hi Quoc,

Mr. Micawber gave you a short and simplistic answer.

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