##### 主语从句 - 主语从句 - **Whether** the rabbit ate the carrot is obvious - **Where** the rabbit ate the carrot is obvious - **When** the rabbit ate the carrot is obvious. - **How** the rabbit ate the carrot is obvious - **Who** ate the carrot is obvious - **What** the rabbit ate is obvious - 形式主语 - It is obvious whether the rabbit ate the carrot - It is obvious where the rabbit ate the carrot - It is obvious when the rabbit ate the carrot. - It is obvious how the rabbit ate the carrot - It is obvious who ate the carrot. - It is obvious what the rabbit ate.