My book in my shoolbag.
I study at home.
Her pen on the desk.
He go to work by bus.
I often exercise after dinner.
in：He is in the school.（他在学校里。）
at：Tom is at home.（汤姆在家中。）
on：My book is on the desk.（我的书在桌子上。）
by：She goes to the park by bike.（她骑自行车去公园。）
after：Li Lei often plays football after school.（李磊经常在放学后踢足球。）
There is a ball in the box.
I go to bed on time at night.
I go to school by bus.
I want to play football after school.
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