Contrary to what Saussure tried to "establish with his distinction between langue' and 'parole', the nature of the primary speech acts that are performed in the use of a natural language is determined by the semantic structure of that language" (Vanderveken, 1990: 166). Actual natural languages like English and Arabic offer a great number of speech act verbs whose meanings serve to identify the possible illocutionary forces of the utterances (Vanderveken, 1990: 166). In this paper, we will apply the illocutionary logic of general semantics to Arabic and to proceed to the lexical analysis of about thirty important commissive verbs "/Paf fa:l - ul - wulu:d/" which have an illocutionary point as part of their meaning. We will give description of their meaning and confine ourselvs to a 'direct semantic analysis' of these verbs. We will also give a description of their logical fomm and specify the actual components of the illocutionary forces or acts which they name. In analysing Arabic commissive verbs "af Ja:l - ul - wuluad/", our aim is to study how the set of illocutionary forces is lexicalized in the Arabic vocabulary. analysis of English speech act verbs that have been made by Searle and Vanderveken (1985), and Vanderveken (1990