Birds build nestsuses the active voice; nests built by birdsuses the passive voice.
Birds build nestsuses the active voice; nests built by birdsuses the passive voice.
鸟筑巢用主动语态；被鸟筑的巢用被动语态
Birds build nestsuses the active voice; nests built by birdsuses the passive voice.
鸟筑巢用主动语态；被鸟筑的巢用被动语态