12.3. exercise: Formation of the presente do conjuntivo
The presente do conjuntivo is used, as in all other tenses in subjunctive mood, after all verbs, conjunctions, idiomatic expressions that describes a subjective attitude towards a hypothetical action, event, process. It describes therefore a possibility that is described in a positive or negative way, but not facts. The notion was taken from latin, modus coniunctivus, what steems from coniungere, to connect. As most of the grammar notions taken from latin the notion is not really appropriate. The notion points to the fact that the subjunctive mood is used in subordinate clauses introduced by a conjunction. The problem is, not in all subordinate clauses introduced by a conjunction the subjuntive mode is used. More appropriate would be possibily mood. Possibilities are described in subjunctiv. (More appropriate is therefore the english and spanish name, subjunctive and subjuntivo, because the subjunctive is used if an action / event is subjectively evaluated. Brasilian grammar books prefer the term subjuntivo as well.)
It is formed by leaving out the ending of the first person singular presente do indicativo, o, poder => posso => poss, and by adding to what is left the corresponding endings , -e, -es, -emos, -em in the case of verbs whose infinitive ends on -am and -a, -as, -amos, -am in the case of verbs that ends on -ir / -er. Symplifying: a becomes e and e / i becomes a. If we put aside the fact that the first person singular of the presente do indicativo can be irregluar, poder => posso => possa, possas, possamos, possam, the presente do conjuntivo is in general regular..
Conjugate the following verbs in the presente do conjuntivo. The first person singuar of the presente do indicativo is given, because in some verbs it is irregular.