which sentence begins with a dependent clause?

a. When we go to school in the morning, we need to take our lunches and our backpacks.

b. My dad is looking for his shoes while our dog is burying them in the garden.

c. The children decided to play soccer in the park near their house.

d. My friends and I are going camping today, and tomorrow my cousin is going to join us!

b. My dad is looking for his shoes while our dog is burying them in the garden.

The sentence that begins with a dependent clause is:

a. When we go to school in the morning, we need to take our lunches and our backpacks.

To determine which sentence begins with a dependent clause, we need to identify which sentence has a clause that cannot stand alone as a complete sentence.

In sentence (a), "When we go to school in the morning" is a dependent clause because it does not express a complete thought and relies on further information to make sense.
Therefore, the sentence that begins with a dependent clause is:

a. When we go to school in the morning, we need to take our lunches and our backpacks.