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edited Feb 8, 2016 at 4:55

Which tense should I use in "I was talking about … when she started to talk about …"?

I was talking to her about something else when she suddenly started to talk about what he had been up to these days.

I was talking to her about something else when she suddenly started to talk about what he was up to these days.

I was talking to her about something else when she suddenly started to talk about what he has been up to these days.

I was talking to her about something else when she suddenly started to talk about what he is up to these days.

Which of the above sentences grammatically correct? What's the difference in their meaning?

asked Feb 7, 2016 at 19:22