1.否定:My brother isn't very tall. 一般疑问:Is your brother is very tall? 肯定:Yes,he is.否定:No,he isn't.提问: Who is that tall boy? 2.否定:Susan isn't a teather. 一般疑问: Is Susana teacher. Yes,she is/No,she isn't.提问: What does Susan do? 3.否定:I am not 13 years old. 一般疑问:Are you 13 years old?Yes,I am./No,I am not....
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