Which sentence uses consistent verb tense?
1. the police officer rounded the corner and pumps his arms harder.
2. the animals scrambled to get into the barn as the lightning struck.
3. alexander finished his math test and walks to mr. smith's desk.
4. sampson and raina watch the fireworks and will comment on how beautiful they are.

The answer is 2. I answered before and I was correct but the admins keep deleting it. So, if you guys could stop deleting this so I don't have to keep rewriting it that would be nice.  .-.

this is what i put and it was correct

it's a way for authors to communicate with reader in this time period. books from the past can teach us about life.

a complex sentence consists of an independent clause and one or more dependent clauses.  

to write complex sentences, we must use subordinating conjunctions.  

all the complex sentences begin with a subordinating conjunction and when it occurs, a comma must be place at the end of the dependent clause. on the contrary, if the sentence begins with an independent clause, then no comma is used.

after  

although  

as  

because  

before  

if  

since  

when  

for example,  

after she won the competition, she became very popular.  

although my father was hurt, he continued fighting for his rights.  

as all of you got a ten, you will be able to leave early today.  

before he went to the war, he asked his parents to bless him.  

if it is cold, i won’t go out.  

since you didn’t bring the homework, you will get low grades.  

when it is hot in the town, everyone goes to the beach.