switch的过去式和用法例句
switch的过去式和其他时态：
过去式: switched
过去分词: switched
现在分词: switching
switch的用法：
switch的用法1：switch用作名词时意思是“开关”“转换”,用作动词时意思是“拧开关”“转变”“转换”,指通过某种措施或办法使某事物改变或改换其原有的位置、名称或运行方式等,引申可表示“挥动某物打某人”“打开”。
switch的用法2：switch可用作及物动词,也可用作不及物动词。用作及物动词时,接名词或代词作宾语,也可接以动词不定式充当补足语的复合宾语。
switch的用法3：switch也可用作名词,意思是“开关”“改变,转变”。
switch的过去式例句：
1. He took his flashlight from his jacket pocket and switched it on.
他从夹克口袋里拿出手电筒，打开开关。
2. As the era wore on, she switched her attention to films.
随着这个时代慢慢过去，她把目光投向了电影业。
3. He switched off the transformer and the buzzing stopped.
他关掉变压器，嗡嗡声就消失了。
4. In half an hour, they'd switched the tags on every cable.
半个小时内，他们就给每根电缆都换了标签。
5. She emptied both their mugs and switched on the electric kettle.
她把他们俩的杯子倒空，烧上了电水壶。
6. There was a little portable television switched on behind the bar.
柜台后面有一台开着的便携式小型电视机。
7. He trotted to the truck and switched on the ignition. Nothing happened.
他匆匆走向卡车并转动点火开关，结果没有任何反应。
8. I switched off the engine and coasted round the corner.
我熄掉引擎，靠惯性转过弯去。
9. Glass parked the car and switched the engine off.
格拉斯停好车，熄了火。
engine什么意思10. The device automatically disconnects the ignition when the engine isswitched off.
当引擎关掉时，这个装置会自动切断点火开关。
11. She switched on one bar of the electric fire.
她打开了一片电暖器。
12. The ballot boxes have been switched.
投票箱被人调换了。
13. His focus switched to the little white ball.
他把关注点转移到那个小白球上。
14. She braked to a halt and switched off.
她刹车停下，然后将车熄火。
15. She switched off the coffee-machine.
她关掉了咖啡机。
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