just (something that happened)

to move to an earlier time, to do something in advance, to do sooner than planned, to perform ahead of schedule

first ... only then

How long have you lived in China for?

How long will you be vacationing here?

first ... then ...

again (for things that have happened already)

(to do) again, re-

again and again, over and over (hypothetical statement)

and then, also, furthermore