Эта квартира — наша собственность, в то время как у них ипотека.

Questions & Answers about Эта квартира — наша собственность, в то время как у них ипотека.

The phrase в то время как literally translates to "in that time how." Does it only refer to time?
No. While it can mean "while" in a strictly temporal sense (two things happening at once), here it acts as a conjunction of juxtaposition. It translates perfectly to "whereas," contrasting two states (our full ownership vs. their mortgage) without focusing on time.
I know а also shows contrast. Could we just use а here instead of в то время как?
Yes, you could completely replace it and say ..., а у них ипотека. The conjunction а is the everyday way to express this. Using в то время как simply makes the sentence sound slightly more formal or analytical, much like choosing "whereas" instead of "while" or "but" in English.
What are the punctuation rules for в то время как? Could the comma go right before как?
When it means "whereas" to contrast two clauses, the phrase acts as a single unbroken conjunction. Therefore, the comma goes before the entire phrase (, в то время как). You only split it with a comma (putting it right before как) in specific contexts emphasizing the exact time, which doesn't apply to juxtaposition.
Why is there a long dash between квартира and наша собственность?
In Russian, when both the subject (квартира) and its descriptor (собственность) are nouns in the nominative case, you use an em-dash (—) to bridge them. This acts as a replacement for the missing present-tense verb "is."

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