What is difference between in and at?
= in refers to inside the library and at generally refers to meeting outside at the entrance (although English speakers can use both to mean the inside)..
What preposition is used for place?
We use the preposition “in” for an enclosed space or a place which is surrounded by boundaries. Examples: The dog is in the garden. I have an apple in my bag.
Where do we use regarding?
Regarding to is not like according to or due to. However, you have plenty of grammatically correct options to use. Regarding and in regard to both mean respecting or concerning. For example, you might tell someone, “In regard to the phrase “regarding to,” I just learned that it’s incorrect.”
Where should I use could?
Could, would, and should are all used to talk about possible events or situations, but each one tells us something different. Could is used to say that an action or event is possible. Would is used to talk about a possible or imagined situation, and is often used when that possible situation is not going to happen.