Step-by-step explanation:
Note, in the English Language, the term modifier refers to a word, phrase, or clause that is used to modify (or adds meaning to) other words in a sentence. Note, the modifier of the sentence is bolded.
1. "On her way, Jan found a gold man's watch." Here, the word 'a' (a proposition) acts as a modifier of the word, "gold man's watch".
2. "The child ate a cold dish of cereal for breakfast this morning." Here, the phrase"a cold dish of" modifies the word "child ate", And the word, "this" modifies the word "morning".
3. "The torn student's book lay on the desk." Here, the word, "on the" acts as the modifier of the phrase, "The torn student's book lay".
4. "Just John was picked to host the program," Here, the phrase "was picked to" modify the phrase, "host the program".