1. Ignore the words in-between because they do not affect agreement.

2. If the two subjects are joined by ¡°and¡±, the verb will be plural in most situations except that when the joined subjects are preceded by ¡°every,¡± ¡°no,¡± or ¡°nothing¡±.

3. Use a singular verb with sums of money or periods of time.

Ex) Ten dollars _____ a high price to pay. (be)

In this sentence, 'ten dollars' is used as a sum of money. So you have to use the singular verb 'is'.

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Are the explanation above correct? Would you check punctuation marks and the explanations?

1. Ignore the words in-between because they do not affect agreement. Do you mean the words between the subject and the verb in the sentence? If so, then you should write this: Ignore the words between the subject and verb because they do not affect agreement.

2. If the two subjects are joined by and, the verb will be plural in most situations except that when the joined subjects are preceded by every, no, or nothing. When you are referring to words as themselves (not using them as their meaning in a sentence), you need to put them in italics, not quotation marks.

3. Use a singular verb with sums of money or periods of time.

Ex)<~~change ) to : Ten dollars _____ a high price to pay. (be)

In this sentence, ten dollars is used as a sum of money. So you have to use the singular verb is.
Again, when you are referring to words as themselves you need to put them in italics, not quotation marks.

The content of your sentences is correct, and they read smoothly. Good job!

The explanation above contains correct punctuation marks and provides accurate explanations for each rule. Let's break down each rule and its corresponding explanation:

1. The rule states that words in between the subject and verb do not affect the agreement. For example, in the sentence "The dogs, as well as the cats, play in the yard," the word "as well as the cats" is not relevant to the subject-verb agreement, and therefore the verb "play" remains plural.

2. This rule states that when two subjects are joined by "and," the verb is usually plural, with the exception of when the subjects are preceded by "every," "no," or "nothing." For example, in the sentence "John and Mary are going to the store," the verb "are" is plural because there is no preceding "every," "no," or "nothing."

3. This rule states that a singular verb should be used with sums of money or periods of time. For example, in the sentence "Ten dollars is a high price to pay," the singular verb "is" is used because "ten dollars" is treated as a single amount of money.

Overall, the explanations are clear and accurate.