I have answered these questions, but when it comes to the "functions" of the infinitives i get a little stuck.. can you please check the answers that i've chosen? thanks in advance!

Identify the function of the infinitive in the sentence. Choose from the following: subject, direct object, object of the preposition, predicate noun, adjective, adverb

1. The person to ask is your mother.

Function of the infinitive: adjective

2. It is too expensive to travel.

Function of the infinitive: predicate noun?

3. Chance hates to erase the boards.

Infinitive phrase: to erase the boards

Function of the infinitive phrase: adverb

4. To know her is to love her.

Infinitive phrase: to know her
Function: subject

Infinitive phrase: to love her
Function: direct object

6. To speak clearly is essential to being understood.

Infinitive phrase: To speak clearly
Used in sentence as: subject

7. My goal is to write a best-selling novel.

Infinitive phrase: to write a best-selling novel
Used in sentence as: adverb

8. The psalmist says, "To do Thy will I take delight."

Infinitive phrase:To do Thy will I take delight
Object of the infinitive: delight

Please help! These are so confusing :/ I know that infinitives are: "to ___" but what I don't know is the functions.. thanks in advance <3

Most of your answers are wrong. Please study your text and these sites. Then repost.

http://sparkcharts.sparknotes.com/writing/englishgrammar/section1.php

http://eweb.furman.edu/~moakes/Powerwrite/partspeech.htm

Let's go through each sentence one by one and determine the function of the infinitive:

1. The person to ask is your mother.
Function of the infinitive: adjective
--> This is correct. The infinitive "to ask" is describing or modifying the noun "person" in the sentence.

2. It is too expensive to travel.
Function of the infinitive: adverb
--> This is incorrect. The correct function of the infinitive here is "adjective." The infinitive "to travel" is describing or modifying the pronoun "it" in the sentence.

3. Chance hates to erase the boards.
Infinitive phrase: to erase the boards
Function of the infinitive phrase: direct object
--> This is incorrect. The function of the infinitive phrase is "direct object." The infinitive phrase "to erase the boards" is functioning as the direct object of the verb "hates."

4. To know her is to love her.
Infinitive phrase 1: to know her
Function: subject
Infinitive phrase 2: to love her
Function: predicate noun (also known as a subject complement)
--> This is correct. The first infinitive phrase "to know her" is the subject of the sentence, and the second infinitive phrase "to love her" is the predicate noun, renaming or describing the subject.

6. To speak clearly is essential to being understood.
Infinitive phrase: To speak clearly
Used in sentence as: subject
--> This is correct. The infinitive phrase "To speak clearly" is functioning as the subject of the sentence.

7. My goal is to write a best-selling novel.
Infinitive phrase: to write a best-selling novel
Used in sentence as: adjective
--> This is correct. The infinitive phrase "to write a best-selling novel" is describing or modifying the noun "goal" in the sentence.

8. The psalmist says, "To do Thy will I take delight."
Infinitive phrase: To do Thy will I take delight
Object of the infinitive: delight
--> This is incorrect. The function of the infinitive phrase is "adverb." The infinitive phrase "To do Thy will I take delight" is providing additional information about how the speaker takes delight. It is not directly connected to the noun "delight" in the sentence.

I hope this helps to clarify the functions of the infinitives in these sentences. If you have any further questions, feel free to ask!