about tense...

[ruofei]

Dear teachers ,
I was wondering about the tense I should use in theses following sentences:

1) I become/ became/ have become addicted to....
2) A new generation was/ is born.
3) It's the 3rd time I do/ I've done/ I did.

I thank you in advance for looking into this.
My best regards.

[Tdol]

1- the present is unlikely, unless you keep getting addicted. If you are still addicted, then use the present perfect, and if you've quit, then go for the past.
2- It depends on the time of birth
3 have done

[ruofei]

:) Dear Tdol, thank you for your prompt!
As for qu.#3, let's say I'm talking about a new generation of Esperanto learners that's growing more and more significant, these days. (do I use use 'was' or 'is' then?)