将下列句子改为否定句1、The boys often play in the playground.2、David le

The boys don't often play in the playground。David does not learn a lot from this book。The hot cottee near the clock is not for the doctor。The girl in red does not study very hard every day。Do not stand in a line。She usually does not watch insects at the weekends。Mike and I do not have four lessons in the morning。