Actually they're participles also known as verbal adjectives.

When it comes to words like "interesting" vs "interested", the adjectives that end in "ed" have the idea of being in that state whereas the "ing" ones are the source of that condition. "She was interesting (the source / cause) so I became interested (the state / effect). In order to recognized a past tense verb vs an adjective, do two things. 1) Remove the "ed" and see if the word still make sense as a verb. If not, it's probably only an adjective. 2) Look at the location of the word in the sentence. Every sentence needs at least one verb, and it usually follows a subject. So you can tell by how the word is being used.

because you have to add ed to noun to make them adjektive. And would you like to make a deal with me??

hey alina....yes the ed refers to the past in most adjectives...to recognize present tense you can usually drop the ed