The following sentence is from a ”A study in scarlet” by Arthur Conan Doyle:
If you are unable to come I shall give you fuller details, and would esteem it a great kindness if you would favour me with your opinion.
As per my question title I wonder if and can conjoin two main clauses with different time sequences. For me I shall give and I would esteem are different unless they can be both regarded like some kind of future.