Adjectives ... Present and Past Participles

Present participles are formed by adding –ing to the verb stem. As an  adjective, a present participle modifies a noun that affects someone or something else.modifies a noun that is affected by someone or something else.

The new song is interesting.

The new song was interesting.

Past participles are formed by adding –ed, to the verb stem, but some of the irregular forms may end in –d, –en, –n, or –t. As an adjective, a past participle

The fans are interested in the new song.

The fans were interested in the new song.