At, in and on are the three comrnon preposions.They are all used to talk about time and position in spece. The differences between them are rather complicated, and it is not always to know which of the be is correct. ...At, in and on are the three comrnon preposions.They are all used to talk about time and position in spece. The differences between them are rather complicated, and it is not always to know which of the be is correct. In order to provide refendnce for studying and teaching, I’ vesummed up the usage of the threeas follows.展开更多
文摘At, in and on are the three comrnon preposions.They are all used to talk about time and position in spece. The differences between them are rather complicated, and it is not always to know which of the be is correct. In order to provide refendnce for studying and teaching, I’ vesummed up the usage of the threeas follows.