なってきています and なっています


What´s the difference between なってきています and なっています?

For example: お隣の人達、大丈夫? ヤバくなってきているよ。

Would it´s meaning change significantly if it´s changed into: お隣の人達、大丈夫?
ヤバくなっているよ。




It would be helpful if gave specific examples because what seems like a simple
question touches some quite complicated grammar, which I will try to cover
briefly:

First you need to understand the nature of ~ている. There are several questions
covering this quite well so I won't repeat them but will try to summarise:

なる is a "punctual verb", that is to say that when using the ~ている form, the
resultative state precludes the continuative state. In other words if we say:

> この地方は交通が便利になっています。

This usually means:

> In this region the public transport has become convenient. (i.e. "is
> convenient")

It can also mean "is becoming convenient" but to convey that sense (ie it is
in a transition state) additional words, typically adverbs are often used to
create the context. eg:

> この地方は交通がだんだん便利になっています。
>
> In this region the public transport is gradually becoming [more and
> more]convenient.

Second: 〜てくる／〜ていくis used to convey change in position or time. Often these
communicate the movement/action of the speaker (「いってきます！」）or movement of
something/action with respect to the speaker (「電話がかかってきた」）but they can also be
used to convey continuation of a state or "process of change". eg:

> この地方が交通がだんだん便利になってきた。これからは観光客が多くなっていくと思う
>
> In this region public transport gradually became convenient. Going forwards,
> I think the number of tourists will be very large.




It would be helpful if gave specific examples because what seems like a simple
question touches some quite complicated grammar, which I will try to cover
briefly:

First you need to understand the nature of ~ている. There are several questions
covering this quite well so I won't repeat them but will try to summarise:

なる is a "punctual verb", that is to say that when using the ~ている form, the
resultative state precludes the continuative state. In other words if we say:

> この地方は交通が便利になっています。

This usually means:

> In this region the public transport has become convenient. (i.e. "is
> convenient")

It can also mean "is becoming convenient" but to convey that sense (ie it is
in a transition state) additional words, typically adverbs are often used to
create the context. eg:

> この地方は交通がだんだん便利になっています。
>
> In this region the public transport is gradually becoming [more and
> more]convenient.

Second: 〜てくる／〜ていくis used to convey change in position or time. Often these
communicate the movement/action of the speaker (「いってきます！」）or movement of
something/action with respect to the speaker (「電話がかかってきた」）but they can also be
used to convey continuation of a state or "process of change". eg:

> この地方が交通がだんだん便利になってきた。これからは観光客が多くなっていくと思う
>
> In this region public transport gradually became convenient. Going forwards,
> I think the number of tourists will be very large.

