That is correct. You could also say: Tom has been unemployed for a month.
Yes, that statement is correct as a way to indicate the passage of one month since the letter was posted.
yes
No, "pre-planned since a month" is not grammatically correct. It would be more accurate to say "pre-planned for a month" or "planned in advance for a month."
Either may be correct depending on context. If you are merely specifying the month then it would be correct to say your birthday is in that month. Being more specific you would say your birthday is on a specific date.
yes notice belongs to month so apostrophy s
The sentence should be: "I really wish this month of November would end soon."
No, the correct way to say that would be... "You should just go to work"
No, the correct phrasing is "I would love to work." This construction uses the modal verb "would" to express a hypothetical or desired action in the present or future.
"Has been" is correct, because "a block" is singular.
You have been travelling is correct. You would never say you have been on travelling, although for poetic emphasis you could say you have been travelling on.
No. For plural, like are, you can say have been. For singular you would say has been.
No. You would say "It will be helpful" or "It would have been helpful."