【Grammar】为什么有的句子中with前直接接在所修饰词后,有的with前却加了逗号???

为什么有的句子中with前直接接在所修饰词后,有的with前却加了逗号???例程：He gave his card,with a few words in pencil.He gave his card,with a few words in pencil.
翻译：他把它的名便给我,上面有几个铅笔字
解析：with a few words in pecil是伴随状态,所以要用逗号,前面是一个完整的句子。而有时候He write with a pen.像这个句子前半句并非是一个完整的句子,所以不能用逗号
例程：Flask has many configuration values, with sensible defaults, and a few conventions when getting started.