Which sentence is a complex sentence?
A. We are out of toothpaste.
B. I brushed my teeth, but mom had no toothpaste.
C. I left the store before I remembered it.
D. I will buy more toothpaste tomorrow.
Which sentence is a complex sentence?
A. The lockers in my old school were small.
B. Most of them were in the hallway.
C. I hated mine because it was outside the gym.
D. The gym is four floors away from my home room.