"The person I sit next to"
I'm a bit confused on the structure of this sentence. Is it any of the following? :
La persona con quien me siento a lado
La persona de que me siento a lado
Or is it none of these? I get quite confused with sentences that would end (in English) with the preposition "of", such as a lado de, despues de delante de etc.
3 Answers
La persona que está sentada a mi lado. The person who is seated next to me.
La persona que se sienta a mi lado. The person who sits next to me
La persona sentada a mi lado. The person seated next to me
La persona sentada a mi lado. The person seated at my side.
Sometimes it pays to shift your thinking. By thinking "I am sitting next to this person" you are the subject and the other person is the object (I'm sitting next to him) This sort of forces you into using a preposition before que like you were trying to do. If you shift your thinking...He is seated next to me, now you are the object and the other person is the subject, which makes it easier to form the Spanish phrase I think.
By the way, if you really wanted, for some reason, to have a structure with "me siento" the following might work. It just doesn't seem as natural to me.
La persona a quien me siento al lado. (The person to whom I sit adjacent?)
By the way, I gave you some alternative ways to say this because, depending on the sentence that you are trying to construct, one might be better than another.
I made up a couple of sentences in another post to show you how it might be done.
It's EL avión . It Is a masculin noun in Spanish. It's correct to use the subjunctive twice in the last sentence.La persona que estaba SENTANDO Is wrong.I like k....'S second sentence
there are a few minor mistakes in the text below, mostly having to do with gender. I posted this text separately to ask for corrections, and have corrected that other post so I won't go through the trouble here.
La persona que se sentó al lado de mí en el avión era tan gordo que no pude moverme.
The person who sat next to me on the plane was so fat I could not move.
La persona sentada a mi lado en en el avión era tan gordo que no pude moverme.
The person seated next to me on the plane was so fat I couldn't move.
La persona que estaba sentando a mi lado en el avión era tan gordo que no pude moverme.
The person who was sitting at my side on the plane was so fat I couldn't move.
La persona que estaba sentado sentada a mi lado en el avión era tan gordo que no pude moverme.
The person who was seated at my side on the plane was so fat I couldn't move.
Espero que la person que se siente a mi lado en el avión no sea demasiado gordo.
I hope that the person who sits next to me on the plane isn't too fat.
Please correct my Spanish if necessary. Of the first four sentences, which, if any would be the best way to say it? I personally like the first one because it emphasizes the person sitting (after I was already seated) next to me by using the preterite). The second one, to me, emphasizes the duration of the event although I think the remainder of the sentence does that well enough in the first sentence. The third sentence seems to just say the same thing as the second in a more complicated way. The fourth sentence, using the continuous form of the verb (non reflexive), doesn't seem very "Spanishy" 
Thoughts?
Also, am I correct in using the subjunctive twice in the last sentence? I think I should because, for the first verb (sentarse) the person who will sit next to me is unknown, and the second verb (ser) is the one that is being ruled by the Espero que clause. Right?
