Question

difference between in and at
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Answer 1

both are the preposition in is used for someting inside the box etc and at is use for pointing something above the box or table etc.

Answer 2

In is used for : 1.year.....e.g in 2020

                        2. month.......e.g.in march

                        3. season.......e.g. in winter

At is used for : time......at four a clock

                        specific time......at dinner, at lunch, at brunch, etc

                         sopecific place........at the picnic