He has no homework today .用Neither have I还是So have I

-----Has Sam finished his homework today?-----I have no idea has sam finidhed his homework today?I have no idea.He ----it —Has Tommy finished his homework yet?—I have no idea; he --- 用So am I,So do I,So have I,So can I,Neither am I ,Neither do He has got a new computer的答语我也是用so do i还是so have i, I have never been there,___he?neither has he neither did he I have to do my homework ,so I do还是so I have. I have no lessons today I have to r____ my homework today He has been to Canada.So have I.这里为什么不是 So has I 呢 He has been to Canada. So have I. 这里为什么不是 So has been I 呢 i have't been to america .-_____A so have i B neither have i