I saw him reading.
He has been a League member since five months ago./Five months ago,he became a .../ It has been five months since he became...
My aunt has been in Shenzhen for ten years.
It has been /It is half an hour since the meeting began.注意：不要用has begun for half an hour:begin瞬间动作,不能延续,不能与表示一段时间的状语连用
My friends din't tell me the place for us to meet./the place where we should/would meet.