The word 大人びた is in common use in Japanese, but I noticed that I couldn't
think of another use of ～びる apart from that.
[EDICT](https://www.edrdg.org/jmdictdb/cgi-
bin/entr.py?svc=jmdict&sid=&q=2409210) lists only 大人びた and 鄙びた.
[Kotobank](https://kotobank.jp/word/%E3%81%B3%E3%82%8B-614131) lists 田舎びた and
古びる, although according to a Japanese friend of mine, the standard usage is
古びた.

**Question 1** : Is ～びる always in the past tense because it expresses a
current state? Could it be used to describe a future possibility, i.e. using
大人びる to express that someone will become more grown up. `その子はどんどん大人びるだろう？？`

**Question 2** : Are there other words (apart from those listed above) which
contain ～びた and are in common use in Japanese?
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question
words suffixes morphology
What are the characteristics of the suffix ～びる?
> Question 1: Is ～びる always in the past tense because it expresses a current
> state?

No. When you use it in the position of the predicate, what is currently in
that state is expressed like その子は大人びている. The same can be applied to modifying
clauses like その大人びている子, but this time, you can rephrase it as その大人びた子 as well.

> Could it be used to describe a future possibility

Yes.

> Question 2: Are there other words (apart from those listed above) which
> contain ～びた and are in common use in Japanese?

I don't come up with any besides ひなびた, 大人びた and 古びた.
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answer