问题描述：
句型转化：This is 【 my good friend】.(对中括号的内容提问) （ ） is this?
It's an English book.(变成一般疑问句)
( ) ( ) an English book
He is a math teacher.(变成否定句)
He （ ） a math teacher.
It's an English book.(变成一般疑问句)
( ) ( ) an English book
He is a math teacher.(变成否定句)
He （ ） a math teacher.
问题解答：
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