"If Erin speaks to her husband on Tuesday", the word or phrase that the modifier belong to is " her husband".
A modifier in grammar is a word or a phrase that is used to define a word, a subject or an event.
There are two major types of modifiers. they are:
In this case, the modifier is an adjectival phrase "her husband" it defines or qualifies "Erin".
Learn more about modifiers at:
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