in + سنه in 2000
in + شهور السنه in May
In + فصول السنه in Winter in Summer in Spring in Autumn
In the morning
In afternoon
In the evening
At night بالليل
At noon فى الظهر
at the age of فى عمر كذا
He died at the age of 70
At the time of فى عصر / عهد
ولكن لاحظ الجملة الاتية :
Dugongs live ( at – in- until ) the age of 70 years .

He is good at Arabic
at home فى المنزل
**correct :
He has been (in ) home (………)

At + الساعة at five O'clock
At twenty past six
At the front of فى مقدمة
At the back of خلف كذا
At the bottom فى القاع
At the top فى القمة
At school
At home
At the park
At the shops
On + ايام الاسبوع on Monday
On + تاريخ يوم on December 4th

We met him ( on- at- in ) the first of April .
On holiday فى اجازة
On my way home
On business فى مهمة عمل
On TV فى التلفزيون
On the radio فى الراديو
On the internet على الانترنت
On the plane على متن الطائرة
On the main road على الطريق الرئيسى