Steve's suggestion is the best, but if you want to apologise in a more formal way, then: I deeply regret what occurred, and I promise that I will make every effort and do everything in …
A (about) and C (regarding) are synonymous.About is the most natural preposition, regarding is more stilted. They both indicate questions which concern the …
It depends. You would use 1. for books in general, without having specific books in mind. You would use 2. for example if you have two books in front of you - in that case, 'which' …
10. Will describes an action that is expected to take place in the future. It expresses certainty. Would describes something that was in the future at the time of the original action, but …
I'm thankful that "SOURCE 1" says: "This is one of those occasions in English usage that lets you follow your ear to determine what works best." My ear doesn't like appeal, and …
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