When stressing words with more than three syllables, it's important to understand the concept of primary stress and secondary stress. In English, most words with more than two syllables have one primary stressed syllable and possibly one or more secondary stressed syllables. Here are some general rules for stressing words with more than three syllables: 1. Identify the primary stress: Look up the word in a dictionary to find the symbol that indicates the primary stressed syllable. For example, in the word "communication," the primary stress is on the third syllable: com-mu-ni-CA-tion. 2. Listen for natural speech patterns: Pay attention to how native speakers naturally stress longer words in conversation or presentations. This can help you understand where to place emphasis. 3. Understand prefixes and suffixes: In many cases, prefixes and suffixes have their own stress patterns that can affect the overall stress of a word. For example, in "unbelievable," both "un-" and "-able" have secondary stresses, but the primary stress falls on "lieve." 4. Practice pronunciation: Practice saying the word out loud, exaggerating the stressed syllable to make it clearer. This can help you get a feel for where the emphasis should be placed. Remember that there are exceptions and irregularities in English pronunciation, so it's always helpful to listen to native speakers and practice regularly to improve your ability to stress words with more than three syllables accurately.