- I do not eat fast food.
- I don't eat fast food.
What is the difference between them? In everyday speech, we use #2. Can't we use #2 in a formal writing at all? When we say #1, what is the difference compared to #2? Is #1 stronger in meaning than #2?
- I do not eat fast food.
- I don't eat fast food.
What is the difference between them?
They mean the exact same in definition.
In everyday speech, we use #2. Can't we use #2 in a formal writing at all? I am hesitant to use contractions (Line 2) in any formal communication. I would not use them in a cover letter for a job or in an email to my boss. I would also not use them if communicating professionally for business or personal reasons. It is not grammatically incorrect, but does read better to certain people. I do not think anyone would view you negatively using option 1 in any scenario. It sounds a little strange in speech to a native speaker, but the expression is identical.
When we say #1, what is the difference compared to #2? Is #1 stronger in meaning than #2?
Back to the response of the first question. By definition Don't and Do not mean the same thing. Contractions shorten the length of the word/phrase but do not change emphasis or meaning.
However, when looking at everyday application of these phrasings in natural conversation I believe this changes. "I don't do that." "I don't smoke cigarettes." "I don't eat meat." I think all hold less seriousness then the non contracted version. "I do not smoke cigarettes." "I do not eat meat." Part of this could certainly be my natural speech pace/thinking pace places an emphasis on not. Since I am contradicting the verb immediately. "I do NOT eat meat." "I do NOT like you." It feels unnatural to place emphasis anywhere else in the sentence. There is such a natural instinct to expect "don't" that when "do not" is used it holds more seriousness. The speaker or the writer wants to make sure I understand that they "Do NOT".