5.
The speedy roller coaster at Bush Garden zoomed around the corner and down the steep
incline.
a. “The speedy roller coaster" is the complete subject.
“The speedy roller coaster at Bush Garden" is the complete subject.
“Roller Coaster" is the complete subject.
d. “Zoomed around the corner and down the steep incline" is the complete subject.
Go get the dog out of the neighbor's yard.
a.
Sentence structure is incorrect.
Sentence is an interrogative sentence.
Sentence is an imperative sentence, and the subject is "you understood."
Sentence contains no subject.
When are you going to the mall?
“When are you" is the complete subject.
"You going to the mall” is the complete subject.
c. “When" is the complete subject.
d. “You" is the complete subject.