Sentence (b) is correct, but the phrase "off to Scotland" uses be off, not off to. The to is part of to Scotland. This is meaning 34 of "off" in the WordReference dictionary: 34. starting on one's way; leaving [be + off] I'm off to Europe on Monday. Some other examples of how "off" is used this way: After breakfast, we'll be off.
Good day, I would like to ask if it is right to say "I'm off today." What I mean is that I'm not at work today because it's my day off. Does it have a similar meaning to "It's my day off today.?" Thank you in advance.
I am confused about the way to express the time that you are not required to work. Is there any differences in the use of the expressions "day off" and "day leave"? Thanks in advance for your help.

Hi, kind people I have a confusion between get off work and take off work. I want to ask my friend when he stops his work at his job for the day. So should I ask him like this: "What time do you get off work?" Or should I ask him another way: "What time do you take off work...
What is the meaning of "off the back of something" Also, I searched for any old posts in here, and I was able to find this one. Off the back of this Therefore, I am really confused whether "off the back of something" can be used as two types of idioms.

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I take it to be offline, in the meaning of not actively linked to a computer or central computer. WR gives, under the entry offline, but under meaning 37 of 'line': 37 Off-line not actively linked to a computer or central computer. offline - WordReference.com Dictionary of English WR...