加介词into，例如：
1、These clashes could develop into open warfare.这些冲突可能会发展成为公开的战争。
2、This situation might develop into an even more newsworthy item if the police were involved.如果警方涉入的话，这个局面就会变得更有新闻价值了。
3、Chaos in the country is likely to develop into civil war.该国的乱局可能演变成内战。
