他参军以前英语

There are five years since he joined the army.Five years ago,he became an armyman.

必须用现在完成时才能表示在参军已经八年了，不用一般过去时。但是参军是短暂性动词，所以不能用动作，必须用状态：He has been in the army for eight years.

正确的语法是： He has been in the army for eight years. 因为 “since” 只用于由那一年开始，例如：1990。

他参军八年了英文翻译：He has joined the army for eight years。