"Ouch! I stepped on one of those plastic toy bricks left on the floor again! ?"

Which of the following parts of speech is the word "ouch"?

This sentence correctly uses a comma before "so" to connect two ideas. The other sentences have missing or incorrect punctuation.

The language convention violated in the sentence is pronoun-antecedent agreement. The pronoun "you" does not agree in number with its antecedent "a person." It should either be "he or she" or "they" to agree with the singular or plural antecedent.

A complex sentence is one that contains an independent clause and at least one dependent clause.

In Choice C: "Since time was running short, I hurriedly brushed my teeth while breakfast was warming up," we have an independent clause: "I hurriedly brushed my teeth," and a dependent clause: "Since time was running short." The dependent clause cannot stand alone as a complete sentence, so it depends on the independent clause for its meaning. This combination of an independent and dependent clause makes Choice C a complex sentence.

The other choices are not complex sentences because they either lack a dependent clause or do not have the same level of complexity in their structure.

Proofreading is the final step, where you check for spelling and grammar mistakes. The other steps happen earlier in the writing process.

The sentence that demonstrates proper subject-verb agreement is D. "Physics is a difficult subject to learn." In this sentence, the singular subject "Physics" agrees with the singular verb "is."

The final step of the writing process is editing, where the writer reviews and revises their work for clarity, coherence, and correctness.

Checking for spelling is a step in the proofreading process. Proofreading involves reviewing a written document for errors and making corrections as necessary. This can include checking for spelling errors, grammar mistakes, punctuation errors, and formatting issues.

It follows all the rules of punctuation compared to the rest.

In the given sentence, "the class" is a singular noun and requires a singular possessive pronoun. "Its" is the correct form of the possessive pronoun "it" to use with a singular noun, as opposed to "it's," which is a contraction of "it is" and would not be appropriate in this context. "They're" is a contraction of "they are" and would not be appropriate because "class" is singular, not plural.

This sentence is spelled correctly. The other choices have mistakes: "hear" instead of "here," "price" instead of "prize," and "harestyles" instead of "hairstyles."