position of adverbial modifiers of time in conditional clauses

[Palych]

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Is the position of adverbial modifiers of time in the conditional clauses free? So, are both of the sentences correct?

"He could have got injury if at that moment he had been in the office."
"He could have got injury if he had been in the office at that moment."

[Rafaelinrio]

"He could have got injury if at that moment he had been in the office."
"He could have got injury if he had been in the office at that moment."

Hey, concerning the position of the adverbs it's totally ok, however a few things need to be corrected.

"He could have GOTTEN INJURED if at that moment he had been in the office"
"He could have GOTTEN INJURED if he had been in the office that moment"

This sentence sound very formal, probably me as a native would say the following:

"He could have been injured if he were at the office that moment"

[Palych]

Thank you for your answer and comments.

But do native speakers use the past indefinite when in the conditional clause a time is not specified? So, is it correct to say:

"He would have done that better if you sent him a detailed discription"

instead of

"He would have done that better if you have sent him a detailed discription"?

And why did you use "gotten" but not "got"? As I know, both of the forms are used as participles.

[Rafaelinrio]

"He would have done that better if you sent him a detailed discription"

In this case I would say:

"He would have done that better if you HAD sent him a detailed discription"

Thisd is basically the structure. When you have an IF clause, if one of the clauses is in the present perfect, the other has to necessarily be either in the past perfect or simple past.

See these for example:

"If Mary had studied for her exam, she wouldn't have failed it"

"I could have helped you if you had called"

"We could have gotten there on time if we had taken the subway"

Regading the got or gotten form, both are accpeted but got is usually used as the past participle of get in British English. Here in Canada, as well as in the USA, we use the form GOTTEN.

[Palych]

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"have" in "He would have done that better if you have sent him a detailed discription" was just a slip of the pen but nevertheless thank you for your comments.

I suppose, that the following deduction is right - if the conditional clause refers to a undefined period the past perfect is used.

If the conditional clause refers to a defined period, past perfect or present indefinite is used - but what influences on the choice?
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