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My textbook makes a difference between verbs that describe activities and
verbs that describe changes. Two examples given are:

話す - activity  
結婚する - change

It then goes on to say that 話している describes an action in progress while 結婚している
describes the result of a change (being married). Then it goes on that ている
after transitive verbs describe actions in progress, and ている after
intransitive verbs describe states that hold after the change takes place.

It's clear to me that 結婚する is a change verb, but I'm not sure if 結婚する is
transitive or intransitive. All the dictionaries I've checked don't list 結婚する,
just 結婚. But, in any case, do intransitive-change verbs always coincide? Or
are there transitive-change verbs?

Also, how can I distinguish an action verb from a change verb? It's not always
as obvious as with 結婚する. Is there any reference or dictionary that tells you
which are which? Or any method you guys use to know which is which?
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question
grammar て-form aspect
Activity verbs vs Change verbs
This is a great question, because Japanese and English don't coincide one-to-
one in some spots. ~ている can mean "current status (as a result of something
happening)" or "currently doing"

Like snailboat mentioned in a comment, if you said 忘れている it means both "in the
state of having forgotten" and "forgetting"

I think if you train yourself to see ~ている as "the current state (as a result
of doing something) is ~" you really can't go wrong.

For example, もらっている？ can mean the same thing as もらった / もらいました (received). It
means "you're currently in the state of having received [something]?" Which is
the same as saying "did you get one?"

There are a few "intransitive" verbs that fit the bill well, like

```

    死んでいる "is dead" ... versus 死んだ (died)
    
```

edit: Actually there are many intransitive verbs that work in this way, I
won't say "all" but to me it seems like all of them do.

```

    開いている : Open / Opened (like a store)
    
    植わる -> 植わっている Has been planted / is being planted 
    
    タクシー が止まっている (The taxi has stopped) -- of course as pointed out in other answers it can also mean "the taxi is in the middle of stopping" 
    
```

* * *

**もう is often used** as a qualifier to emphasize that something "already
happened"

```

    もう もらっている (have already received)  [space added for clarity]
    
```

**And まだ ~ない** (まだ plus negated verb) is often used to express clearly "not
yet"

```

    まだ もらっていない (not yet received) or "I haven't gotten one yet"
    
```

Hope that helps
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answer
> "It's clear to me that [結婚]{けっこん}する is a change verb, but I'm not sure if
> 結婚する is transitive or intransitive."

In Japanese, it is intransitive. You can only say 「Person + **と** + 結婚する」,
**_never_** 「Person + **を** + 結婚する」.

> " All the dictionaries I've checked don't list 結婚する, just 結婚."

Of course not, because 「結婚する」 is **_two_** words. For the sake of a smooth
discussion, however, we will pretend that it is one word and is a verb.

> "do intransitive-change verbs always coincide? Or are there transitive-
> change verbs?"

There certainly are transitive-change verbs. For instance, all the verbs that
get translated into "to wear" are examples of those.

[着]{き}る (to put on tops)、[履]{は}く (to put on bottoms)、かぶる (to put on hats)

「スミ子は白いシャツを着ている。」 can actually mean two different things, strictly speaking.

  1. State: "Sumiko has a white shirt on." and

  2. Action: "Sumiko is in the middle of putting on a white shirt."

For the Action meaning, however, native speakers will almost always use a
different structure such as:

「白いシャツを着ている **ところ** です。」 or

「白いシャツを着ている[最中]{さいちゅう}です。」

Conversely, if a native speaker reads or hears the sentence 「スミ子は白いシャツを着ている。」
without any further context, chances are that we are likely to think it means
"Sumiko has a white shirt on." She probably put it on 12 hours ago for all we
know.

> "Also, how can I distinguish an action verb from a change verb? It's not
> always as obvious as with 結婚する."

The distinction is not always clear. You can destroy a vase in a second but it
would take you a while to destroy a large building.

In foreign language acquisition, **_both_** the teachers and the students look
for simplified rules about grammar points and such when, in reality, any
natural language is full of exceptions.
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answer