three questions of "old nature" kind

1. When is it right to put the before the determiner the before the  word "future" and when not?

The first sentence is Nona's:

Phew, this is a long one Believer, it might be better if you split these things up into several posts in future.

In the future, you can ask him  help.

Somewhere in the future, it might be his.

2. Can you give me some more examples where this kind of genitive form??? is acceptable? I got this partial sentence from a U.S. government website that tells about U.S. history. Maybe you can refer me to a previous post.

Among the most significant early explanations was that of Hernando De Soto (why not, Henando De Soto's), a veteran conquistador who had ...  

3. I sometimes have difficulty clearly seeing the difference between the cases involving  the words the most and most. Help.

I like this most.

I like this the most.

This is the most attractive pieces of clothing I have seen so far.

This is most attractive pieces of clothing.  

Hi Believer

1. There is a slight difference between in future and in the future. In future means 'from now onwards':
I'm tired of helping you, in future you'll have to manage on your own.

In the future means 'in the period of time ahead of this, but not necessarily immediately ahead':
No one knows what will happen in the future.

2. He took a trip to the capital of Italy and that of Spain. (instead of: ... and the capital of Spain.) Not: that of Spain's!
In the plural: I can't remember the names of all the people we met and those of their dogs. (instead of: ... and the names of their dogs.)

3. When most is an adverb, the can usually be omitted: I like this (the) most. Or: I like this (the) best. He can run (the) fastest.
When most is used in a superlative with an adjective, 'the' is usually needed: This is the most difficult question.

In very formal English, you can have 'a' before most to form an absolute superlative:
This is a most difficult question. (= This is a very difficult question.)
If no noun is used, 'a' is not used: This is most difficult. (= This is very difficult.)

Cheers
CB

Hi Believer

You're welcome. There is no difference in meaning in the sentences you have quoted. Sometimes, especially when a superlative is formed with most, it is advisable to use the article to avoid ambiguity:

He can sing the most beautifully.

'He can sing most beautifully' often means the same as 'he can sing very beautifully'.

Cheers
CB