* tried: This is the past tense of the verb "try".
* to inform: This is an infinitive, which functions as a noun in this case. It's the object of the verb "tried".
* her: This is a possessive pronoun indicating ownership.
* problem: This is a noun and the object of the preposition "to".
Therefore, the parts of speech in the sentence are:
* tried: Verb (past tense)
* to inform: Infinitive (noun)
* her: Possessive pronoun
* problem: Noun
Let me know if you have any other sentences you'd like help with!