请检查我写的
1. 我在军事学院学会了开枪。 ( perfect tense)
2. 有些国家有目的(sounds more formal)地参与军事矛盾,因为战争是赚钱的。
3. 宗教战争可以无限期地持续下去。
(This sentence is grammatically correct and natural, But it has two very different means according to the context
A The religious wars are endless, no matter how human want stop them
B The religious wars are endless, people can always make up a reason to proceed it
)
4. 1945年5月9日(号 is not often used in formal expression, you can use 号 in daily oral Chinese)伟大卫国战争结束了,苏联获得了胜利。( perfect tense, more formal one 苏联为国战以胜利告终)
5。第二次世界大战结束以后,我们国家开始参与维持新的国际秩序。