Dear,sir
Following are two short passages, and the question lies in them.
Then the unexpected happened. I had no thought in
reaching the natural heights that a human structure
would be present. Normally, I would have avoided any
such structure as I directed my steps toward the natural view. In retrospect it makes sense that a service building be present at the trail end. It may have had facilities for visitors and played an interpretive role. But the building was not present when I arrived.
From An Experience of Aesthetics by Robert Ginsberg
I go to visit my great-aunts. A few of them think now
that I am my cousin, or their daughter who died young. We recall an anecdote about a relative last seen in 1948, and they ask if I still like living in New York City. I have lived in Los Angeles for three years, but I say that I do. The baby is offered a horehound drop, and I am slipped a dollar bill "to buy a treat." Questions trail off, answers are abandoned, the baby plays with the dust motes in a shaft of afternoon sun.
From On Going Home by Joan Didion
When describing an event in the past, when should the present tense be used, instead of the past tense, and how to switch the two tenses in the same paragraph smoothly so as not to make it inconsistent.
Thanks in advance.


