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<p style="color:#333333;font-weight:normal;font-size:16px;line-height:30px;font-family:Helvetica,Arial,sans-serif;hyphens:auto;text-align:justify;" data-flag="normal"><b>A salesman explains a new product. 销售员说明新产品。</b></p><p style="font-size:16px;line-height:30px;font-family:Helvetica, Arial, sans-serif;color:#333333;font-weight:normal;text-align:justify;" data-flag="normal"><br />(1) 改为以 I 为主语的现在进行时的句子<br />—> I'm explaining a new product. 我正在说明新产品。</p><p style="font-size:16px;line-height:30px;font-family:Helvetica, Arial, sans-serif;color:#333333;font-weight:normal;text-align:justify;" data-flag="normal"><br />(2) 改为以 He 为主语的过去时的疑问句<br />—> Did he explain the new product? 他说明新产品了吗？</p><p style="font-size:16px;line-height:30px;font-family:Helvetica, Arial, sans-serif;color:#333333;font-weight:normal;text-align:justify;" data-flag="normal"><br />(3) 改为以 Who 开头的过去时疑问句<br />—> Who explained the new product? 谁说明了新产品？<br /><br /><b>Everyone comes back from lunch. 大家吃完午餐回来。</b><br ...