[观察例句]
观察下列句子并指出所用的时态和语态
1．My washing machine is being repaired this week，so I have to wash my clothes by hand. 现在进行时的被动语态
2．I was sent to the village last month to see how the development plan had been carried out in the past two years.
一般过去时的被动语态
3．When fat and salt are removed from food，the food tastes as if it is missing something. 一般现在时的被动语态
4．The students have been working hard on their lessons and their efforts will be rewarded with success in the end.
一般将来时的被动语态
