long before

long before 很久以前

【例句】

◆ He told me that he had been to the Great Wall long before.他对我说他很久以前去过长城。 

◆ We've known her long before.我们很久以前就认识她。

【联想】 

It wasn't long before.…没过多久就…… It won't be long before...没过多久就会……