Are "sous" "au-dessous de" synonyms?

Question

Could I say:
"le chien dort sous la table" (the dog sleeps under the table)
and also: "le chien dort au-dessous de la table"??
Somehow I like the sentence with "sous" better.
Also: which is correct?
"je te n'aime pas" or "je ne t'aime pas"

"je t'ai aimé" or "j'ai t'aimé"

Answer 1

Sorry, I have no idea why this posted twice; especially since I wasn't even finished yet!!!
I still wanted to add "thank you for your help".

Answer 2

au dessous de = below

sous = under

as prepositions, they are interchangeable

je t'ai aimé

Sra (aka Mme)

Answer 3

Would "je te n'aime pas" be correct, or "je ne t'aime pas"?

Encore une fois - merci beaucoup de votre aide.