School leaders said during a roundtable Monday that there are simply too many unknowns to say what classes will look like this fall.

Don Williams, the head of the state's largest teachers' union, says teachers are eager to get back to the classroom with new safety measures in place because with distance learning, a lot of children are falling through the cracks.

"Class sizes will have to be reduced," Williams says. "The numbers of students riding school buses will have to be reduced accordingly."

Teachers are asking for staggered start times, smaller class sizes, personal protective equipment for everyone in school and new lunch and classroom seating formats.

School systems are questioning how they will pay for the measures.

"Our schools will also have to pay for technology, for perhaps more people to help with various different things in the classroom," says Bob Rader, of the CT Association of Boards of Education.

The state epidemiologist, Dr. Matthew Cartter, warned schools to have a back-up plan if there's a second wave of COVID-19 in the fall.

"Our plans need to be flexible enough to be able to turn rapidly and adjust to that particular setting," he says.

School superintendents say it's likely to see a hybrid of in-person classes and those taught by computer so that the buildings are less crowded.

The Connecticut Interscholastic Athletic Conference said it plans to issue guidance to schools.