cool16
Could anybody explain me how if- then construction works in past tense , in context of above question
regards
I assume that you are just curious, because we do not need to know anything about conditionals to answer the parallelism question.
The non-underlined portions commit us to
-- an IF clause in past tense (
if the administration improved), and
-- a RESULT or MAIN clause in the present conditional tense (
could be)
When the IF clause has simple past tense, we have a Type 2 conditional.Type 2 conditionals deal with a hypothetical or unlikely condition and its probable result.
If THIS thing happened,
Then THAT thing would (or could or might) happen
(or then THAT thing would be happening)
Only a Type 2 condition uses
simple past tense in the IF clause.
That fact is our cue that
could, must, might, or another modal auxiliary verb will be in the main THEN clause.
(I don't care whether we define
would as a modal. Just know that it, too, is a very probable candidate for the main clause.)
The present conditional is formed this way:
would or
modal +
bare infinitive(+ the infinitive of the main verb, without
to)
Examples, IF clause in simple past, main clause in present conditional:
We might travel more often if we had more time.
If he was angry with me, I could not have known.
He could buy his school books if you lent him money.Modals are allowed only in the
main clause of a Type 2 conditional statement, and never in the if statement.
So we are locked into a Type 2 conditional by the sentence's structure in the non-underlined parts.
Further, modals (could, might, etc.)
(1) can show up in type 2 conditionals and
(2) can be split off from the main verb,
but that fact is not a function of the
conditional dimension of the sentence.
We can split the verbs in a list because English allows ellipsis (omission of words). English uses reduced phrases and clauses all the time, not only in conditional statements.

Hope that helps.