The office clock is ten minutes fast. 办公室的时钟快十分钟。 (1) 改为疑问句 —> Is the office clock ten minutes fast? (2) 改为附加疑问句 —> The office clock is ten minutes fast, isn't it? (3) 把 The office 改为 Your watch “你的手表”，并改为“慢十分钟” —> Your watch is ten minutes slow. 你的表慢了十分钟。 The client placed a large order. 客户订了大量的货。 (1) 改为疑问句，时态还是过去时 —> Did the client place a large order? 客户订了大量的货吗？ (2) 句子开头加入 I wish “我希望……” 提示: 时态要用过去完成时，表示与过去事实相反的愿望 —> I wish the client had placed a large order. 我希望客户订了大量的货。 (3) 改为以 When “什么时候”为开头的过去时疑问句 —> When did the client place a large order? 客户什么时候订了大量的货呢？