Re: What's the difference between "He does do it" and "He does it"?
Welcome to the forum.
Originally Posted by fdbjruitoirew
First, look at the amendments I made to your post. Be careful with your verb endings and your use of tenses. Also remember to start every sentence with a capital letter and to end every sentence with a single appropriate punctuation mark. Note the correct spelling of "document".
"We do receive your document" is unnatural English. I would expect to see "We received your document" or "We have received your document".
"He does wear a blue raincoat" is fine in certain contexts. Firstly, you would have to be talking about a habitual action, not a single event. Secondly, you would have to be emphasising a point you had already made, perhaps a point that someone else has contradicted.
John: James never wears a blue raincoat.
Sarah: He does wear a blue raincoat. I've seen it.
Remember - correct capitalisation, punctuation and spacing make posts much easier to read.