How to resolve two indirect objects? (Prohibition of two に in a sentence?)


Based off [sawa's comment from this
question](https://japanese.stackexchange.com/q/3478/542):

> "you cannot have two ...に phrases. Remove either."

And using the same verb "同意する", I looked up the dictionary and found:

> 1.（人）に同意する - to agree with a person
>
> 2.（意見・提案・計画など）に同意する - to agree with an opinion/suggestion/plan/etc.

Let's say I agree with a person about an opinion/suggestion/plan that does not
necessarily belong to that person. This way I'm **not** using the genitive-の
to connect the parts together as in `(人)の(意見・提案・計画)に同意する`. Instead I'm trying
to express that I agree with a person with something.

Deducing from the above dictionary excerpt, I would form a sentence with two
`に`s (Which I now know is wrong from sawa's comment).

Flawed (pun not intended) attempts at constructing the sentence:

> ｘ 私は計画に彼に同意します
>
> ｘ この計画が彼に同意します (I just realised that this means "This plan agrees with him"
> (Unless sarcasm is taken into consideration, this sentence cannot make any
> sense))

**(Question)** What would be the proper way to construct this sentence?




After doing some reading up, here's what I learned.

Two にs in a sentence like `私は計画に彼に同意します` cannot be allowed because `計画` and
`彼` will share the same thematic role1 if both are assigned に. This causes a
problem because `同意する` can only assign two roles - `Agent(私)` and
`Theme(Either 彼 or 計画)`

Breaking down the sentence "I agree with him on this plan." yields:

> Main verb: agree
>
> Agent : I
>
> Theme: him
>
> Location (Abstract location): plan

Now using the above, I will try to build the Japanese version of the sentence.

> Main verb: 同意する
>
> Agent (marked by は in this case): 私
>
> Theme (marked by に): 彼
>
> Location (marked by で for location of verb action): 計画

Putting them together I'll get `私はこの計画で彼に同意する`.

* * *

1: Here is a list of the major thematic relations extracted from
[Wikipedia](http://en.wikipedia.org/wiki/Thematic_relations):

> **Agent** : deliberately performs the action
>
> **Experiencer** : the entity that receives sensory or emotional input.
>
> **Theme** : undergoes the action but does not change its state (Sometimes
> used interchangeably with patient.)
>
> **Patient** : undergoes the action and changes its state (Sometimes used
> interchangeably with theme.)
>
> **Instrument** : used to carry out the action
>
> **Force or Natural Cause** : mindlessly performs the action
>
> **Location** : where the action occurs
>
> **Direction or Goal** : where the action is directed towards
>
> **Recipient** : a special kind of goal associated with verbs expressing a
> change in ownership, possession.
>
> **Source or Origin** : where the action originated
>
> **Time** : the time at which the action occurs
>
> **Beneficiary** : the entity for whose benefit the action occurs
>
> **Manner** : the way in which an action is carried out
>
> **Purpose** : the reason for which an action is performed
>
> **Cause** : what caused the action to occur in the first place; not for
> what, rather because of what




After doing some reading up, here's what I learned.

Two にs in a sentence like `私は計画に彼に同意します` cannot be allowed because `計画` and
`彼` will share the same thematic role1 if both are assigned に. This causes a
problem because `同意する` can only assign two roles - `Agent(私)` and
`Theme(Either 彼 or 計画)`

Breaking down the sentence "I agree with him on this plan." yields:

> Main verb: agree
>
> Agent : I
>
> Theme: him
>
> Location (Abstract location): plan

Now using the above, I will try to build the Japanese version of the sentence.

> Main verb: 同意する
>
> Agent (marked by は in this case): 私
>
> Theme (marked by に): 彼
>
> Location (marked by で for location of verb action): 計画

Putting them together I'll get `私はこの計画で彼に同意する`.

* * *

1: Here is a list of the major thematic relations extracted from
[Wikipedia](http://en.wikipedia.org/wiki/Thematic_relations):

> **Agent** : deliberately performs the action
>
> **Experiencer** : the entity that receives sensory or emotional input.
>
> **Theme** : undergoes the action but does not change its state (Sometimes
> used interchangeably with patient.)
>
> **Patient** : undergoes the action and changes its state (Sometimes used
> interchangeably with theme.)
>
> **Instrument** : used to carry out the action
>
> **Force or Natural Cause** : mindlessly performs the action
>
> **Location** : where the action occurs
>
> **Direction or Goal** : where the action is directed towards
>
> **Recipient** : a special kind of goal associated with verbs expressing a
> change in ownership, possession.
>
> **Source or Origin** : where the action originated
>
> **Time** : the time at which the action occurs
>
> **Beneficiary** : the entity for whose benefit the action occurs
>
> **Manner** : the way in which an action is carried out
>
> **Purpose** : the reason for which an action is performed
>
> **Cause** : what caused the action to occur in the first place; not for
> what, rather because of what

