Question

grammar
trains and railroad tracks crisscross throughout this country. (2) locomotives provide power for trains. (3) they pull several attached railroad cars. (4) steam diesel and electricity have all been used to power trains. (5) passenger trains and freight haulers mostly use railroad tracks originally laid more than 100 years ago. (6) modern - day commuters, though, may use an electric rail system or may drive their own vehicles.
49 multiple choice 1 point
which statement describes sentence 1?
it has a compound predicate
it has a simple subject.
it has a compound subject.
it is missing a subject.
clear my selection
50 multiple choice 1 point
which two sentences can be combined into one sentence with a compound predicate?
sentences 1 and 2
sentences 2 and 3
sentences 3 and 4
sentences 4 and 5
clear my selection
51 multiple choice 1 point
which of the following has a compound subject?
sentence 2
sentence 3
sentence 5
sentence 6

Explanation:

Question 49

To determine the correct option for Sentence 1 ("Trains and railroad tracks crisscross throughout this country"), we analyze the subject:

• A compound subject consists of two or more simple subjects joined by a conjunction (e.g., "and," "or"). Here, "Trains" and "railroad tracks" are two simple subjects joined by "and," so the subject is compound.
• A simple subject would be a single noun/pronoun, which is not the case here.
• A compound predicate has two or more verbs, but Sentence 1 has one verb ("crisscross").
• The sentence has a subject ("Trains and railroad tracks"), so it is not missing a subject.

To identify which two sentences can be combined with a compound predicate, we need sentences with the same subject and different verbs (or verb phrases) that can be joined.

• Sentence 4: "Steam, diesel and electricity have all been used to power trains." (Subject: Steam, diesel, electricity; Predicate: have been used)
• Sentence 5: "Passenger trains and freight haulers mostly use railroad tracks originally laid more than 100 years ago." (Subject: Passenger trains and freight haulers; Predicate: use) → Different subject, so not a match.
• Sentence 2: "Locomotives provide power for trains." (Subject: Locomotives; Predicate: provide)
• Sentence 3: "They pull several attached railroad cars." (Subject: They (referring to Locomotives); Predicate: pull) → Same subject ("Locomotives"/"They") and different predicates ("provide" and "pull"), so they can be combined with a compound predicate (e.g., "Locomotives provide power for trains and pull several attached railroad cars").
• Sentences 1 and 2: Different subjects ("Trains and railroad tracks" vs. "Locomotives") → Not a match.
• Sentences 3 and 4: Different subjects ("They" vs. "Steam, diesel, electricity") → Not a match.
• Sentences 4 and 5: Different subjects → Not a match.

A compound subject has two or more simple subjects joined by a conjunction. We analyze each sentence:

• Sentence 2: "Locomotives provide power for trains." → Subject: "Locomotives" (simple subject, singular noun).
• Sentence 3: "They pull several attached railroad cars." → Subject: "They" (simple subject, pronoun).
• Sentence 5: "Passenger trains and freight haulers mostly use railroad tracks originally laid more than 100 years ago." → Subject: "Passenger trains" and "freight haulers" (two simple subjects joined by "and") → compound subject.
• Sentence 6: "Modern - day commuters, though, may use an electric rail system or may drive their own vehicles." → Subject: "Modern - day commuters" (simple subject).

Answer:

It has a compound subject.

Question 50