be动词疑问句：将be动词放主语前，句尾加？
be动词疑问句可以用yes or no回答。
问句格式：Am/Are/Is+主语…？
答句格式：yes,主语+am/are/is.No+主语+am/are/is+not.
(例)Is that man your math teacher?
答句：Yes,he is./No,he is not./No,he is my PE teacher.
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