に vs. が in the ~てほしい construction


I know there are already a few questions about this topic on this website,
however none of them seemed to really help me with the issue.

The ~てほしい contruction is used to express that someone wants someone/something
else to do something. Now, my problem is with the particle that is used to
mark the person/thing that is supposed to carry out the desired action: Should
it be が or に, or can it be both?

In most examples I saw, に was used. For example:

> あなたに幸せになってほしい。

But occasionally, there were also examples with が. So I tried to think about a
solution, and I came up with the idea that maybe が was only used to avoid
misunderstandings, such as in the following example provided by Toshihiko in
the answer to the question [てほしい particle
usage](https://japanese.stackexchange.com/questions/29223/%e3%81%a6%e3%81%bb%e3%81%97%e3%81%84-particle-
usage):

> 私はあなたが彼に英語を教えてほしい。  
>  I want you to teach him English.

But then I found another example sentence:

> 冬が早く来て欲しい。  
>  I want winter to come soon.

Here, the が doesn't seem to be used to avoid any misunderstandings because the
sentence is simple enough as it is.

So after all, what determines if you should use が or に to mark the person or
thing that should carry out the action when using the ~てほしい construction?




が is emphasizing the noun before it than に.

あなたに幸せになってほしい  
I want you to be happy.

あなたが幸せになってほしい  
I want **YOU** to be happy. It's not common and must be some important meaning
on 'you'. More like dialogue in a movie.

Although I feel your second example is simply wrong. In this case we should
use に. Even it has to be "you" who teach him English.




が is emphasizing the noun before it than に.

あなたに幸せになってほしい  
I want you to be happy.

あなたが幸せになってほしい  
I want **YOU** to be happy. It's not common and must be some important meaning
on 'you'. More like dialogue in a movie.

Although I feel your second example is simply wrong. In this case we should
use に. Even it has to be "you" who teach him English.

