Which one is correct? "a specific situation" or "an specific situation"? I know "an" normally goes with words starting with a vowel but in this case...
When someone sends me a mail that asks my availability on a specific date (for example, 12am on May 23rd), how can I respond it correctly? Specifically, the mail says "Are you available at 12am on May 23rd?" In this case, is it correct if I say "Yes, I will be available on that time" or "No, I...
How to respond to mails asking my availability on a specific time ...
There are other specific terms in many other contexts. If you give us more of the context in which you plan to use this sentence, or the subject of your essay, we might come up with some that fit. Lacking any context, the generic "things" is all we have. Added in edit: Cross-posted with the previous poster, who said the same thing in far fewer ...
as at is quite common in this context to mean at a specific time/date. "As of" to me means since. "As of" only rarely means "since" in AE, and it still sounds awkward and confusing to me, so I personally avoid this usage. Example: The washing machine was fixed as of last week. The meaning of this sentence is unclear.
Therefore, "Co." sometimes occurs with "Ltd." and sometimes it does not. In referring to a specific company, you should be guided in the use of these abbreviations by the organization itself—its stationery, literature, Web site, etc. Some companies insist on spelling out one or more of these terms in all cases, some do not.