Thank you so much for your reply; as a result, I have understood the fourth sentence.
However, I still don’t understand the other three sentences. Isn’t the second sentence faulty? It’s made up of two clauses joined by a comma.
As for the first and the third sentences, they were introduced by single words preceding independent clauses. Are they used parenthetically? Could you please elaborate them?
These are all very casual sentences where semicolons would be out of register. ‘(I’m) sorry’ can be considered a commentary interjection in both 2 and 3. In #1, ‘Window’ is simply the object of the verb ‘use’.
Thank you for your prompt reply. I’m pleased to inform you that I’ve also understood the second and third sentences. Basically, they are mild interjections using commas instead of exclamation marks.
However, I’m still doubtful about the first sentence. Technically, is it called the “left dislocation” in the textbook? For example, a left dislocation has a comma preceding the clause—‘Window’, I have used here to mean the chance to learn new ideas.
I look forward to hearing from you. Thank you so much.
No, it is not dislocation in that sense-- that happen with adverbs, for instance. Window is the object of the verb, and as such cannot be separated from its verb by a comma.
‘Window’ I have used here to mean the chance to learn new ideas = I have used ‘Window’ here to mean the chance to learn new ideas
Thank you so much for your help and patience. At last, I’ ve found the answer to the first sentence. It’s called PREPOSING technically, and PREPOSING is used in close connection with something that is previously mentioned. For instance, the first sentence is used by Mr. Alan Townend in the following excerpt.
However, I would like to know where I can read up more material about such a construction. Could you recommend some websites and textbooks, please? Thank you so much for your help and patience.
You’ll need a major comprehensive grammar book, I think, like Quirk, et al’s Comprehensive Grammar of the English Language or Huddleston & Pullum’s Cambridge Grammar of the English Language. I don’t know of any online sources offhand.