Are these sentences OK?
I suspected him all along.
It's hard to say anything clearly already.
We had a few problems in the past, but we get along well now.

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Answer

If I'm not mistaken, you can say ' it's hard to explain it very well" 
or I always find it very difficult to explain things more effectively.
hope that i answered your question:)

Answer

The first and third are good.  I don't understand the second one - it's hard to imagine a context where it might make sense.  You many have misused the word "already".