Answer
Yes, each of these sentences is a valid sentence.
Work Step by Step
Here, we want to replace the components of the phrases to make sure they are valid sentences.
a) the happy hare runs = article adjective noun verb
= noun phrase + verb phrase
b) the sleepy tortoise runs quickly = article adjective noun verb adverb
= noun phrase + verb phrase
c) the tortoise passes the hare = article noun verb article noun
= noun phrase + verb phrase + noun phrase
d) the sleepy hare passes the happy tortoise = article adjective noun verb article adjective noun
= noun phrase + verb phrase + noun phrase
