Sentence:  In English, "I am" is simply reversed to "Am I" to give it the sense of a question. In Japanese, the subject is often omitted, but understood. These are <WSD>alogisms</WSD>. What is expressed specifically in one language may be expressed by specific silence in another and vice versa. 
Meaning of the word marked with <WSD> tags:  An inconsistency or arbitrary situation that follows no logical pattern.