When using CLT, other than relying on explicitly pointing out syntactic slots, (Subj, Adv, etc.), to be filled with appropriate grammatical forms, (such as word, phrase and clause types), it seems that students do not fully understand how they can build sentences or even embed recursiveness. Without this learning of form they are merely trying to memorize situational vocabulary - with or without knowledge of strategic competence. Many forms or structures must be taught explicitly - at first, especially for learning upper level writing skills. When teaching ESL, even in Task Based Learning, language learning can not succeed without structural models and graphic strategies.