Question

what is a sentence?
remember: a sentence expresses a complete thought. the subject and predicate must work together to make the thought complete.
read each example. is it a sentence?
my only sister elisha. \t\t\t○ yes ○ no
behind the shed, under a pile of old sacks. \t○ yes ○ no
the road home stretched ahead of us. \t\t○ yes ○ no

Explanation:

1. For "My only sister Elisha.": It has a subject ("My only sister Elisha") but no predicate (verb or action to complete the thought), so it's not a sentence. So the answer is No.
2. For "Behind the shed, under a pile of old sacks.": This is a phrase with prepositional phrases, no subject or predicate to express a complete thought, so it's not a sentence. Answer is No.
3. For "The road home stretched ahead of us.": It has a subject ("The road home") and a predicate ("stretched ahead of us") that expresses a complete thought, so it's a sentence. Answer is Yes.

Answer:

1. My only sister Elisha. : No
2. Behind the shed, under a pile of old sacks. : No
3. The road home stretched ahead of us. : Yes