When writing, it is important to vary your language to make your writing more interesting and engaging. One way to do this is to use synonyms for commonly used words and phrases. "Was concerned" is a phrase that is often used in writing, but there are many other words and phrases that can replace it. For example, you could use "was anxious," "was worried," "was troubled," "was bothered," or "was preoccupied." Another option is to rephrase the sentence entirely to convey the same message in a different way. By using a range of synonyms and phrases, you can keep your writing fresh and engaging for your readers.