I'm new to Chinese so please forgive me if this question it's dumb.
I read this frase on a lyrics' song: 

> 
> 
> > 
> > 我好想你
> > 
> > 
> > 
> 
> 
> 

And when I search for the pinyin I got this:

> 
> 
> > 
> > wo3 ha3o xia3ng ni3
> > 
> > 
> > 
> 
> 
> 

I know a little bit about tone-shifting and I think that when the there are two third tones together the first one change to a second tone. An example: 

> 
> 
> > 
> > 你好 ni3 ha3o changes to ni2 ha3o
> > 
> > 
> > 
> 
> 
> 

So, in my case, how do tones shift?