bānjiāgōngsī bùshì jīntiān lái, jiùshì míngtiān lái.

The moving company will come either today or tomorrow.

Breakdown of bānjiāgōngsī bùshì jīntiān lái, jiùshì míngtiān lái.

• 今天jīntiān: today
• 明天míngtiān: tomorrow
• 来lái: to come

Questions & Answers about bānjiāgōngsī bùshì jīntiān lái, jiùshì míngtiān lái.

What does the pattern 不是……就是…… mean in this sentence?

It means either...or....

So:

• 搬家公司不是今天来，就是明天来。
• The moving company is coming either today or tomorrow.

This pattern presents two possibilities, and the speaker believes one of them is true.

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Does 不是 here literally mean is not?

Not exactly. In this sentence, 不是 is part of the fixed pattern 不是A，就是B.

So here it does not simply mean a standalone not. Instead, the whole structure means:

• if not A, then B
• more naturally in English: either A or B

So 不是今天来，就是明天来 means:

• either they come today, or they come tomorrow

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Why is 就是 used here? Does it mean is?