四年级英语介词用法归纳如下：
表示时间
in：用于表示周、月、季节、年、泛指上午、下午、晚上。例如：
She reads a book in the morning.
They are playing in the park on weekends.
on：用于表示具体某一天或某一天的上午、下午、晚上。例如：
Today is Monday.
We are having dinner on Friday evening.
at：用于表示具体时刻，如几点几分。例如：
Meet me at 3 o'clock tomorrow.
She arrives at school at 8 am every day.
表示地点
in：用于表示在某个封闭的空间内或时间段内。例如：
The keys are in the pocket.
They live in New York City.
on：用于表示在某个表面或具体某一天。例如：
The book is on the table.
The cat is sitting on the mat.
at：用于表示在某个具体地点或位置。例如：
She is at the bus stop.
The dog is barking at the stranger.
for：用于表示目的或对象。例如：
She bought a gift for her friend.
They are playing for fun.
表示方向
to：用于表示方向或目的地。例如：
We are going to the beach.
She writes to her family every week.
from：用于表示起点或来源。例如：
She is from Canada.
They came from different countries.
表示手段和材料
with：用于表示使用某种工具或方法。例如：
She writes with a pencil.
They traveled with their friends.
其他常用介词
before：用于表示在某个时间点之前。例如：
We need to finish the homework before we go out.
after：用于表示在某个时间点之后。例如：
They will go to the movies after dinner.
by：用于表示通过某种方式或手段。例如：
She came here by bus.
They communicate with each other by email.
希望这些归纳对你有所帮助，祝你在英语学习上取得更好的成绩!
