How To Know When To Breakup

Recently one of my friends told me that there is distinct difference between 'know of something' and 'know about something' expressions. 'know of' is used when you have personal experience with wha... The string I don't know that is grammatical and common and is used to express doubt.

The use of subordinators if or whether after know would suggest a less firm position: he doesn't know or he's not so certain. I don't know that there are bargains yet, but there certainly are opportunities. I don't know that the President has said that he fully supports the conference of the states I don't ...

I'm confused in whether to write know or knows in the following statement:- "The ones who are included know better."? Also explain the difference between the two, thanks. My question is about similar (for me) question forms "don't I know you" and "do I know you". Is there any difference between them or can they both be used in the same context without any exceptions?

Possible duplicate of "Know about" vs. "know of". Also What are the differences between know, know about, and know of? on English Language Learners, which is probably a better site for questions like this.

I am interested to know if, for some, there is a subtle difference between the two phrases in the title. I am equally interested in knowing if there is a subtle difference. Possibly, "I do know that" can in fact only be used, when, you are answering the question of whether or not you know the issue at hand (or your knowledge has been called in to question, and you are answering that challenge).

Let's say "out of the blue" you wanted to state that "you know that" -- and you wanted an emphatic version. For example, some other person introduces you via email and then you respond via email and want to say that you are pleased getting to know him. A formal greeting is required in this case.

Is something like the following appropriate or are there better ways for saying that? Dear John, I am pleased getting to know you! The sentence I'm writing goes like this: As much as I love the pure sciences, I know now a well-rounded education is valuable. But the words "know" and "now" are so similar that every time I read...

D: How d'you know? = How do you know? because C's sentence is present tense. E: I'll shoot my girlfriend if she cheats on me. F: How'd you know? = How would you know? because E's sentence is a future condition.

Notice that I changed the contracted forms. I did that because the pronunciation of the spoken English sentences would change.