Put the adjectives before the nouns.

Here are the sentences with the adjectives placed before the nouns:

1. The boys are happy.

   • Adjective: happy
   • Noun: boys
   • Answer: The happy boys.

2. The sun is bright.

   • Adjective: bright
   • Noun: sun
   • Answer: The bright sun.

3. The day is cloudy.

   • Adjective: cloudy
   • Noun: day
   • Answer: The cloudy day.

4. The pair of shoes is old.

   • Adjective: old
   • Noun: pair (describes the pair of shoes)
   • Answer: The old pair of shoes.

Here are the rephrased noun phrases:

1. $\boxed{\text{The \textbf{happy} boys}}$
2. $\boxed{\text{The \textbf{bright} sun}}$
3. $\boxed{\text{The \textbf{cloudy} day}}$
4. $\boxed{\text{The \textbf{old} pair of shoes}}$