Quick Answer “On a call” is the natural and standard expression when you mean that someone is participating in a telephone, mobile, video, or online conversation. “In a call” is also grammatical, but it has a different focus. It usually refers to being inside or participating in a particular call as an event, especially in…
Quick Answer Use “in the morning” for a general time of day. Use “on the morning of” when you mean a particular morning connected to a specific day or event. The key distinction is not simply that in goes with “morning” and on does not. The preposition reflects how you are conceptualizing the time: a…
Quick Answer “In regard to” is the standard choice. Use it when you mean “concerning,” “about,” or “with respect to.” The key point is that regard and regards perform different grammatical jobs. In the fixed prepositional expressions in regard to and with regard to, regard is normally singular. The plural regards appears naturally in expressions…