Go ahead. You have our permission.

Sorry, no. "I am in the phone book." Existence refers to a state of being rather than a state of being referred to.

"45-ish"

The first is correct. In the first, "what I think you are doing" is a noun phrase operating as the object of "doing" i.e. "Are you doing ?" "Thinking" in the second, could be a gerund if the sentence were taken to mean: "Are you doing

No, it's not idiomatic to say or write six-thirty o'clock. Six o'clock, six-thirty, seven o'clock, seven-thirty, etc. I'm not sure why this is, but that's how it's said. Cheers John.

Hi Quillo In English-speaking countries there's no recognition of family status in addressing letters. Just (for instance): Joe Bloggs 123 Anywhere Street Smalltown New Zealand Of course, it depends on the country whether there will

Yes, it's fine, but it would be an abbreviated way of saying, "Could you help me to jump-start my car?" (because you would have to be involved - i.e. steering while they push). Cheers John.

All correct.

"Myself" would be more natural in this instance. The speaker refers to himself as both the subject and the object, so it's reflexive. Cheers John.

I'll give you a hint. There's a difference between doing and being. Verbs describe both. Cheers John.