Usage of 就 in these two examples

Question

I'm taking an intermediate Chinese course and ran across a character whose usage I can't quite wrap my head around: 就.

I believe the meaning of the character itself are "then, right away, etc." However, I'm finding it difficult to really understand the usage from just the definition itself. Here is an example from the textbook I'm using:

1. 等你来天津， 我就给你当导游。 (When you come to Tianjin, I'll give you a tour.)

2. 等你来天津， 我给你当导游。(When you come to Tianjin, I'll be your guide.)

How should I interpret 就 in this context?

Thank you.

Answer 1

[等 (X) 就 (Y)] = [wait till (X) then (Y)]

Example:

等(你来天津)， 我就(给你当导游。)

wait till (you come to Tianjin,) I'll then (be your tour guide.)

Other combinations:

[一 (X) 就 (Y)] = [once/as soon as (X) then (Y)]

Example:

你一(来天津)， 我就(给你当导游)

Once (you come to Tianjin,) I'll then (be your tour guide.)

[如果(X) 就 (Y)] = [if (X) then (Y)]

Example:

如果(你来天津) 我就(给你当导游)

If (you come to Tianjin,) I'll then (be your tour guide.)

Answer 2

Unlike English, 等你来天津 here is actually a conditional clause. It means if it comes to the time when you come to Tianjian. The OP's sentence can be interpreted by if... then ... structure in English. So, 就 does mean then in that sentence.

Answer 3

等你来上海, 我就给你当导游. Ni bien llegues a Shanghai, te daré un tour o Cuando vengas a Shanghai, yo daré un tour.

等你来上海, 我给你当导游
Cuando vengas a Shanghai, seré tu guía o Seré para ti como tu guía, cuando vengas a Shanghai.