"Don't go into the forest" 是 "别进森林" 的英文表达方式。

这句话的来源是英文中最常用的命令句式之一，即 "Don't + 动词原形"。例如：

Don't run. (别跑。)
Don't speak loudly. (别大声说话。)
Don't touch that. (别碰那个。)

你也可以使用更正式的表达方式，如 "Please do not go into the forest." (请不要进森林。) 或 "I would advise you not to go into the forest." (我建议你不要进森林。)

其他的表达方式还包括：

Stay out of the forest. (别进森林。)
Keep out of the forest. (别进森林。)

例句：

"The forest is dangerous. Don't go in there." (森林很危险，别进去。)
"Please stay out of the forest. It's not safe." (请别进森林，不安全。)
"Keep out of the forest. There are wild animals in there." (别进森林，里面有野生动物。)