English with Epistemic Modality is a conlang created by a conlanger vfaronov in 2013.
Basically, it's just English with additional words:
prould
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/prʊd/
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‘it is generally known’
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silt
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/sɪlt/
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‘I assume’
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wint
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/wɪnt/
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‘I observe directly’
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quane
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/kweɪn/
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‘I was told’
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rill
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/ɹɪl/
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‘the circumstances are such that I think (but I don't bet)’
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seught
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/seɪt/
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‘the circumstances are such that I think but I may doubt’
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sunt
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/sʌnt/
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‘It's true for my mental condition but may be not true for other people’
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deigh
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/deɪ/
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‘must for the common good’
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mant
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/mænt/
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‘must for my own good’
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lunt
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/lʌnt/
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‘must for the benefit of us’
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goave
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/ɡəʊv/
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‘just a guess, just guessing at random’
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oigh
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/oɪ/
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‘Well, I don't bet it, think just as you like’
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Examples
“I am reporting live from Los Angeles where the first real aliens wint be landing right now! You lunt stay with us for this historic event!”
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(≈ you better stay but less formal)
“Aliens? But aliens prould not exist! This silt be a hoax!”
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Aliens prould not exist. Aliens don't exist, period.
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Aliens rill not exist. Aliens as far as I know don't exist. But I don't know for sure. Maybe they exist. What, does the TV say there are?
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Aliens seught not exist. Well, aliens don't exist, don't they?
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Aliens oigh not exist. Oh those invented one more thing. I don't care of scientists, I don't to hear anything, aliens don't exist.
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“Sylvia wint have been here, around 10 in the morning.”
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“A-and... We’re getting reports from the Alien Welcoming Committee right now... The aliens quane be communicating in Morse code on a military frequency”
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“Pete, frankly, your hairstyle sunt suck.”
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“Abortions deigh not be allowed in a civilized country. God Himself quane say so, for it wint be written in the Holy Book.”
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“Da-ad, what’s this strange light in the sky-y?” — “Uh... dunno honey... goave be a plane.”
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“I’ve reviewed your article and it sunt mostly be okay... but the paragraph on ‘possible extraterrestrial influence’ mant be rewritten.”
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(≈ if I were you I would rewrite it)