PREPOSITIONS WORD FAN at, in, on GRAMMAR FAN-ESL is a visual aid/manipulative that is a valuable hands on support for students. It is suitable for students in Year 2, Year 3, Year 4, Year 5 and Year 6. Prepositions of Time Sentences Fan is very good for ESL students as well.The first step is to teach them the Prepositions of Time Sentences Fan and then distribute this fan to help them remember how to apply these rules. They can use it as a reference which can be kept in their desk or pencil case