1.he is being seen by the doctor at this moment.
2.Last week she was being seen by a specialist.
3.The police said the man had been seen locally.
4.The new mini TV sets must be seen to be believes!

1.he is being seen by the doctor at this moment.
这会他正在看医生（看病）呢。
2.Last week she was being seen by a specialist.
上周专家给她会诊。
3.The police said the man had been seen locally.
据警方透露，该男子曾在当地‘出现’。
4.The new mini TV sets must be seen to be believes!
新迷你彩电必须让大众眼见为实。

see并不一定硬翻译为看见，根据语境作灵活翻译最恰当。