Nunca he visitado el museo (I have never visited the museum). Recientemente, he estado enfermo (I have been ill recently).

Nunca he visitado el museo (I have never visited the museum). Recientemente, he estado enfermo (I have been ill recently).

To establish the difference between the use of ‘has/have’ and that of ‘had’, one needs to understand the essence of the past perfect tense.

I have been singing all day. She has been reading. Some people have been in government since 1999. The lecturer has been teaching at UNILAG for eight years. He has been sleeping in the other room.