TORONTO -- Tentative deals have been reached between high school teachers and eight school boards, but more elementary teachers are starting strike action.

The union representing English public high school teachers says the Ottawa-Carleton District School Board was the latest to reach a tentative agreement with its members early this morning.

But only two -- Upper Grand District School Board and York Region -- have been approved by the government.

Hamilton-Wentworth, Thames Valley, Niagara District, Avon-Maitland and Durham school boards are still waiting for the green light.

At the same time, more elementary teachers are set to take strike action.

Teachers at the Rainy River District School Board are in a legal strike position, and those at Trillium Lakelands District School Board are poised to join them next Monday.

The action includes arriving no more than 30 minutes before class starts and leaving no later than 30 minutes after students are dismissed.