Because the correct use of “I’ll not” is “I wont”. That’s why it sounds unnatural, grammatically speaking.
ETA: I teach English in Europe and I tell my students that they can use those contractions while speaking, but not while writing, because it’s harder to convey tone that way. They should also never use it in a formal letter.
Mostly because English has another contraction that’s used for the negative exclusively: won’t.
Other than that, a simple rule of thumb I’d give is to use “I will” when you’re at all trying to emphasize your commitment/desire to do the thing.
In a spoken sentence, “I’ll” has no stress at all, and the “‘ll” is purely a function word. It’ll sound like the main point of your sentence is the thing that you’ll do, not the fact that you’re reassuring the other speaker that you’re going to do it.
Another use case for “I will” is as a response if you’re asked whether you’re going to do something. “I will” can stand on its own as a sentence (or an independent clause), whereas “I’ll” cannot.
Every language has fast versions that show up in casual speech. That’s contractions in English. Everyone has a basic understanding of how this works. If you have a native French speaker, they’ll be familiar with dropping the ‘ne’ in negation because it’s not necessary for understanding, so you cut it. But not in writing or formal speech.
The context for when to use fast versions is pretty universal. There are some differences across generations in some cultures, etc. but by and large if you let them know that’s fast English, they’ll get it right most of the time.
That said, ‘I’ll not’ is contextually acceptable in many places. It’s a slightly more polite way to express opposition – less defiant, more considered – than ‘I won’t’.
Your example is brilliant,
To be honest, I don’t know that any sort of rule applies to “I’ll not use this for profit.” you just sort of have to know that its wrong.
“I’ll use this for profit” sounds absolutely fine
And so does “I will not use this for profit”.
I wouldn’t sweat it, *unless you’re a Russian Sleeper, and don’t want to be caught*.
Most people will know what you mean.
in addition to all the great answers here, don’t use the contraction when the word being lost is the focus of the section.
for example, i have a foreign friend who will respond with: “I’m” in answer to a question. as in: “are you in work today?”, “I’m”. this is wrong, the stressed word in the full sentence is “am”, so contraction is wrong.
also if you want to put particular emphasis on a word, don’t contract. for example, Cinderella might say: “i will go the ball!”. contracting that to “I’ll go to the ball” makes it much more of a normal occasion.
so basically, don’t contract the word away if there’s focus or stress on the word.
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