I have two doubts in this, we normally use it when we want to talk about
two past tense events, we use 'had' for the first instance and past tense
for the second one.
a) When we use it in a single past tense instance, does it mean that it was done
I had already completed it.
Then, how this is different from
'I have already completed it.'
b) I find a person, using it commonly, where past tense could be more appropriate, like
'my battery had gone down' instead of
'my battery went down'
c) I know it can be used in reported, indirect sentences while changing from
past tense to past perfect tense.
Please give me more examples on when to use this form 'HAD' correctly, precisely.
d) When we talk about specific time, it is more appropriate to use past tence.
Like, I completed this work on so and so time.
Suppose, if I want to express about two past tense events, mention the time
for the first instance, can I use 'had' there, for example,
'I had taken leave on 'xyz' date and took your approval on 'xyz + 2' date.'
Is it correct to say,
'I took leave on 'xyz' date and got your approval on 'xyz + 2' date.'