Técnica del Norte University Phonology Group members: Soraya Nieto, Peter Ponce. Theme: Stress in complex words. Topic: Formation of complex words. Question: How does the suffixes and affixes influence into the formation of complex words in the English language? Literature review Thesis statement: The amount of affixes and prefixes someone knows, directly influences into the vocabulary extension of words. Someone who knows more word roots, will easily understand new words by identifying some syllables (affixes, prefixes). Summary: All of the statements emphasize the importance of understanding and learning about morphological structure, specifically regarding suffixes and prefixes, in language education. "The acquisition of suffix knowledge has a positive impact on vocabulary development and overall language proficiency," notes Ward and Chuenjundaeng in their 2009 study. This finding suggests that understanding the function of suffixes can aid in acquiring new vocabulary and improving overall language proficiency. Similarly, Lázaro, Sainz, and Illera in their 2015 study found that the productivity of a suffix has a stronger impact on word recognition for less familiar, low-frequency words. This highlights the importance of morphological processing in reading difficult or less common words. The study by Levinm, Ravid, and Rapaport in 2001 concludes that morphological awareness plays an important role in the spelling ability of young Hebrew-speaking children. It suggests that recognizing morphological patterns in words improves significantly as children progress from kindergarten to first grade. Altay's 2006 paper emphasizes the importance of prefixes and suffixes for foreign language learners, suggesting that knowledge of these components can greatly enhance learners' ability to recognize and understand new words. The paper also highlights the significance of context in understanding the meaning and use of prefixes and suffixes, and offers practical strategies for incorporating this knowledge into vocabulary instruction. The MorphoLex database, according to Claudia H. Sánchez-Gutiérrez in 2018, is a valuable resource for researchers studying the structure and processing of English words. The database provides detailed information on the morphological structure of many words, which can be used to investigate a range of research questions related to morphological processing, vocabulary acquisition, and reading comprehension. The study conducted by Giraudo and Grainger in 2003 found that the presence of a