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？