The Portuguese language has different linguistic variants to express future. These variants are used by the speakers according to their interlocutors, the place and subject at hand. However, the quantity and the description of theses forms in Portuguese teaching manuals for foreigners need to be more detailed. Tafner's (2004) study describes seven verb forms to express future. From these seven forms, only two were found in the manuals. This finding suggests the necessity of revising such verb forms in order to show the functioning of the Portuguese linguistic system. In the analysis of some Portuguese teaching manuals randomly selected, it was verified that the majority of them presents only the simple future (-rei) or the perifrastic form with -ir or both, without providing the student a complete description about their occurrence or contexts that foster the use of one or another. Consequently, the absence of these observations can confound the student when he meets other future forms not included in Portuguese teaching manuals for foreigners.