need有被动语态么 比如it is needed 还是It need to be used?

It is___for us to do eye exercise every day.(need) 是needed么 They used to do it this way变被动语态 it needed hard work to finish the job这里为什么用needed而不用need? ( )I know what it is to be in need and what it is to have __ need作行为动词有被动吗?sb be needed有吗 need的被动语态 be used to doing 有没有被动语态和现在完成时 it is unnecessary.还是it is no need. be needed to do与need to be done used to 当过去常常解释时的被动语态是用be used to 还是用used to be NEED被动的用法为什么有时候是need 有时候是 be+needed 把you need not do it now .变成被动语态．