Sure! Here are the participles in each sentence along with the nouns they modify:
-
Participle: signed
Noun modified: order -
Participle: sitting
Noun modified: pouch -
Participle: singing
Noun modified: voice -
Participle: designed, built
Noun modified: it (the noun "it" refers to the toaster in context) -
Participle: melted
Noun modified: toaster
If you need further analysis or examples, feel free to ask!