tā mǎi le yìshuāng xīn yùndòngxié, shuō zài gōngyuán pǎobù de shíhou bǐ chuān píngshí de xiézi shūfu duō.

possessive particle

Breakdown of tā mǎi le yìshuāng xīn yùndòngxié, shuō zài gōngyuán pǎobù de shíhou bǐ chuān píngshí de xiézi shūfu duō.

• 她tā: she
• 在zài: at

Questions & Answers about tā mǎi le yìshuāng xīn yùndòngxié, shuō zài gōngyuán pǎobù de shíhou bǐ chuān píngshí de xiézi shūfu duō.

What does 了 do in 买了? Is it just past tense?

了 after a verb (here 买了) marks completed action, not “past tense” in the European sense.

• 她买了一双新运动鞋 = She bought a pair of new sports shoes (the buying is completed).
• Without 了: 她买一双新运动鞋 sounds like a plan or a general statement (e.g., on a shopping list), not a specific completed purchase.

Chinese doesn’t have grammatical tense like English; time is expressed through context, time words (昨天, 明天, etc.), and aspect markers like 了, 过, 在. Here, 了 simply tells us the buying is done.

Why do we say 一双新运动鞋 and not something like 两个新运动鞋 or 两只新运动鞋?

For shoes, the standard measure word is 双 (pair):

• 一双鞋 – a pair of shoes
• 两双鞋 – two pairs of shoes

Using 两个 or 两只 with 鞋 would sound unnatural in normal conversation unless you are talking about individual shoes for some special reason (e.g., a one‑legged person or mismatched single shoes).

So 一双新运动鞋 is the natural way to say a pair of new sports shoes.

Why is it 新运动鞋 and not 运动新鞋? What’s the order between 新 and 运动鞋?