Synonyms I can think of for “fast” in similar context:

The service was :

• expeditious
• prompt
• attentive

customer service the pace was swift and lite. The fast’ was available. in person, my request was answered in 24 hours, with no fail.

On the third person”, is “was” the “helper” for the “simple past” passive tense in the first person. Thus, as the phrase “it was possible”, is grammarically correct in simple past passive and you can use it.

But it is also correct to use “were” in the “second conditional” for the first and third person singulars as well as the second person singular and all plurals. In addition to “if you were” and “if they were”, the phrase “if I were” and “if he/she/it were” are also correct.

So, short answer, they’re both right in this case, because the usage of “was/wer” as the past participle is both in the second conditional and in the past simple passive.

Is all three “acceptable” in America?

• When you’re finished” is probably the most proper in all English-speaking cultures;the term is unambiguous and common. Sadly, it sometimes carries a connotation of finality.
• When you have finished, then when you are finished you can no longer stand. This implies the situation in whom you are now. Who are you? When will you encounter the strait? When will you end up on the other side then you are?
• When you are done, is correct in American usage. The term is also popular through the rest of the English-speaking world. It’s probably less preferred because it’s a monosyllabic 4-letter word and therefore looks and sounds less educated.

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