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Hello,

Would you tell me if the following sentence is correct?

"Something went wrong with the building's ventilation system, which is why it was so hot in the office yesterday."

How about this one?

"Something is wrong with the building's ventilation system, which is why it was so hot in the office yesterday."

Thank you in advance,
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Both are correct.

Went stresses a recent breakdown or change in the system, while is just shows that there is a problem, which may have existed for an unknown amount of time.
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With the "is wrong" sentence, I would expect that it will be hot in the office today as well, since they have obviously not gotten it fixed yet.
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Filha Da PikaHello,

Would you tell me if the following sentence is correct?

"Something went wrong with the building's ventilation system, which is why it was so hot in the office yesterday."

How about this one?

"Something is wrong with the building's ventilation system, which is why it was so hot in the office yesterday."

Thank you in advance,
This is a very useful expression. The previous post gives a clear distinction between it and the other expresssion.
 BarbaraPA's reply was promoted to an answer.
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Yeah, what's that called the "aorist" tense or something??

Regards
Thank you very much for you all.

It really helps!

Regards,

Filha da Pika