The present research tackles the problem posed by a special kind of adjectives, namely: -ly adjectives since they are similar in form to the adverbs of manner, or what is known as ly adverbs. In spite of the similarity in form, the two ly forms are variant in features and functions, the thing that the majority of foreign learners in general and Iraqi University Learners of English (IULE) in particular do not pay much attention for, which leads them to confusion by mixing up between the uses of both class items. Thus, the main aim of this research is to investigate this confusion. Another aim is to measure the learners ability of distinguishing ly adjectives from ly adverbs through syntactic position, a two part test was made within data analysis to fulfill this goal. A final purpose on which this research concentrates is to find some remedies or guide lines which can help English language learners to distinguish the various syntactic features and uses of ly adjectives from ly adverbs.