为什么前一个句子是肯定,后一个句子是否定?1) His father didn't die until he

为什么前一个句子是肯定,后一个句子是否定?1) His father didn't die until he He doesn’t think she is right,does he 这是个句子是否定转移,主句是肯定句,为什么反 i didn't sleep until he comes back.句子改错! i didn't sleep until he came back.句子改错! 翻译句子!He watched until he didn't see it again 在英语中,怎样判断一个句子是否定句还是肯定句.例如：很少的人.这是否定还是肯定句. He won't leave until his father comes.中come 为什么加s He didn't do his homework until nine o'clock. 用英文解释句子:I didn;t leave until he came back i didn't sleep until he came back.句子有错吗? 一个英语句子有肯定有否定!~可能么? 英语语法高手请进He turned writer= He becomes a writer 为什么前一个句子不加a,后一