Use "就" to place between two interrogative pronouns

When "就" is placed between two of the same interrogative pronouns, the mentioned interrogative pronouns are not used to express interrogative, but they refer to the same indefinite person, object or manner.

In addition, when the two clauses of a sentence have the same subject, the subject of the second clause can be omitted. However, when the two clauses of the sentence have different subjects, the second subject is put before “就”.

Examples:

什么东西便宜? 我买什么? (two interrogative clauses)

什么东西便宜我就买什么。(change to two clauses which share the same subject)

I'll buy whatever is cheap

你哪天有时间就哪天去看电影。

Go to the movies whenever you have time.

Compare the use of “才”and “就”

Both 才 and 就 are put before a verb as an adverbial modifier to express time. However, they have opposite effects on the tone of a sentence. 才indicates that a speaker has a sense of lateness whereas 就 indicates a sense of earliness.

Using 才 to indicate that a speaker feeling an event occurred later than expected, we use the grammatical phase as “Subj + Time Word + 才 + V”

Examples: (才)

我今天晚上九点才下班。

I'm off work at 9 o'clock tonight.

上了公交车才发现没有带手机。

I got on the bus and found that I didn’t bring my mobile phone.

Using就to indicate that a speaker feeling an event occurred earlier than expected, we use the grammatical phase as “Subj + Time Word + 就 + V + Obj＋了”

Examples: (就)

我不用一小时就做完功课了。

I don't need to finish my homework in an hour.

我晚上九点就睡觉了。

I went to bed at nine o'clock in the evening.

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On a business trip 去出差

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