『毒触手草』に気をつけること。歯が生えてきている最中ですから。
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2016-12-24T16:57:34.157
41950
2016-12-24T19:34:57.290
18119
question
grammar
きている in this sentence?
This is just a standard -てくる formation combined with -ている to express that it's
a continuing process. This might seem awkward in the abstract, not so much
when you think about context. 「歯が生える」 means that "teeth are growing."
Conceptually speaking, teeth aren't a part of you (at least as teeth) until
they grow in, so adding on a -てくる to this makes the nuance more along the
lines of "teeth grow in[to one's mouth]." -ている here just means that the
process is continual, so "teeth are growing in." Putting it all together, you
get something along the lines of "Be careful of the Venomous Tentacula. Its
teeth are coming in."

Since I had no idea what a 毒触手草 was I did a quick Google search and found some
Harry Potter thing. Googling _that_ along with "teeth" led me to
[this](https://www.pottermore.com/quote/teething-problems) page, so if you
have similar questions in the future I'd recommend digging around on Google
for a bit since Pottermore is pretty popular.
CC BY-SA 3.0
2016-12-24T19:34:57.290
41953
2016-12-24T19:34:57.290
18701
41950
answer