Saw 是see (看见)的过去式。
See 的过去时是saw, 过去分词是seen.如:I see him. 我看见他了。这句话变成过去时,就是:I saw him.我(过去)看见他。直接将see 变为saw, 不需要助动词。I see him的现在完成时态是:I have seen him.I see him的过去完成时态是:I had seen him. (我在过去某个时间点之前已经看见他了)I see him的被动语态:He is seen by me.他(现在)被我看见了。I saw him 的被动语态:He was seen by me.他(过去)被我看见了。I have seen him 变成被动语态就是:He has been seen by me.他已经被我看见了。I had seen him 的被动语态就是:He had been seen by me. (他在过去某个时间点之前已经被我看 见了)