They begin their lessons at 8：00（改为否定句）
问题描述：
They begin their lessons at 8：00（改为否定句）
答
They begin their lessons at 8：00.（改为否定句）
They don't begin their lessons at 8：00.
他们不在八点开始上课.
在谓语动词begin前加上带助动词do的否定词就行了.