The boy carefully opened the box to see what was inside.
Meaning: The boy moved the box so that there was a space or hole, and he did this with attention and caution so that he could see what was inside.
Choice of Words: Carefully means to do something with attention and caution. Opened means to move something so that there is a space or hole. When you put them together, "The boy carefully opened the box to see what was inside" means that the boy moved the box so that there was a space or hole, and he did this with attention and caution.
Alternative Expressions
Related Expressions