Odie的英语课 904 Grammar | Instructions 3

It's important to … (make sure the electricity is off)重要的是……（确定电源关上了/确保断电）make sure 确保，确定，确认sure 确定的，肯定的，毫无疑问的It helps to … (wait for the light bulb to cool down) ……是有用的（等灯泡变凉）句子结构：句子开头的 it 是形式主语，句子的真正主语是 to 后面的内容cool down 变凉，冷却，平静下来Be sure to … (turn off the electricity before you touch the light bulb)一定要……（在你触摸灯泡之前先关掉电源）Always … (wear gloves when you touch a light bulb)一定要/千万要……（触摸灯泡时戴手套）Never … (touch a socket with wet hands)千万不要……（手湿着触摸插座）