dōngtiān yàoshi xiàxuě le, tā bú shì zuò dìtiě, jiù shì zǎodiǎnr huíjiā.

If it snows in winter, she either takes the subway or goes home early.

Breakdown of dōngtiān yàoshi xiàxuě le, tā bú shì zuò dìtiě, jiù shì zǎodiǎnr huíjiā.

• 她tā: she
• 了le: change-of-state particle
• 坐zuò: to take (transport)

Questions & Answers about dōngtiān yàoshi xiàxuě le, tā bú shì zuò dìtiě, jiù shì zǎodiǎnr huíjiā.

Why does 冬天 appear at the beginning without 在? Does it mean in winter?

Yes. 冬天 here functions as a time word, and in Chinese, time words often go near the beginning of the sentence without needing a preposition like 在.

So:

• 冬天 = winter
• at the start of a sentence, it often means in winter / during winter

This is very common in Chinese:

• 明天我去。 = I’m going tomorrow.
• 晚上他不出门。 = He doesn’t go out at night.

So 冬天要是下雪了... naturally means If it snows in winter...

What does 要是 mean here? Is it just another way to say if?

Yes. 要是 means if, and it introduces a condition.

In this sentence:

• 要是下雪了 = if it snows / if it ends up snowing

Common Chinese words for if include:

• 如果 — common, slightly more formal
• 要是 — common in speech, very natural
• 假如 — more formal/literary

So 要是 is a very normal conversational way to say if.

Why is there a 了 after 下雪 in 下雪了?