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"classes are in session" is correct and usable in written English.
It is usually used when referring to school or university classes and typically indicates that the classes have already begun and are currently in progress. For example, you might say "Classes at the local university are in session now, meaning classes have already started for this semester."
Exact(11)
The off-duty officer will cost Iona $29 an hour for 12 hours a weekend when classes are in session.
And it pays to conduct emergency preparedness drills, but not ones that involve students nor ones that are staged when classes are in session.
When choosing among several colleges, visit the colleges while classes are in session to see how comfortable you feel at each college.
While the ideal time to visit a college is when classes are in session, the summer months are often the most convenient time for families to travel.
About 1,200 seats are earmarked for Duke's undergraduates, but this season students have filled about 700 a game while classes are in session.
Visit the colleges when classes are in session to see how you like the atmosphere and how well you fit in.
Similar(47)
When no classes were in session, a giant television screen played videos of exercise classes.
The packed Chargers-Dolphins games was complicated because classes were in session Monday.
The reasons included the timing of the quake, while classes were in session, and the age of school buildings.
Classes were in session at the time of the attacks, and hundreds of terrified children and frantic parents struggled to find each other.
No classes were in session when the plane hit, but officials were determining how many people on the ground were injured or killed, he said.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com