At the beginning:
In the middle:
The last week:
At the end:
When teachers teach summer school
it’s impossible
When teachers teach summer school
At the beginning:
In the middle:
The last week:
At the end:
At the beginning:
In the middle:
The last week:
At the end:
At the beginning:
In the middle:
The last week:
At the end:
Teaching In Real Life 