I got confused with an exercise. I had to fill in the gaps and I instinctively used present perfect in the first gap... then I thought it was a passive sentence and I corrected it but now I ‘m confused... here’s the sentence 

wine - is being produced- in Napa valley since the 19th century, but it - has been- only since the 1960s that wine of any particular quality - is being produced- 

are the tenses between the dashes correct? Or were they all mere present perfect?

Original Post

Hi, Macris, and welcome to the Grammar Exchange.

Sorry for the delay in answering your question, which I read a few days ago but was unsure about myself.

I think I'd use the present perfect progressive in the passive voice in the first coordinate clause to indicate continuity, and just the present simple for the verb be in the cleft clause and the passive form of the present perfect to indicate the occasional (not necessarily continued) production of certain kinds of wine from some time in the past till now:

- Wine has been being produced in Napa valley since the 19th century, but it is only since the 1960s that wine of any particular quality has been produced.

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