It expresses an action that is to take place in a moment. It consists of the tense form of the verb aller (to go) + the infinitive:
singulier | pluriel | |
1 | vais parler | allons parler |
2 | vas parler | allez parler |
3 | va parler | vont parler |
The same verb aller in imparfait in conjunction with infinitives expresses an action that was about to take place in the past (so-called futur proche dans le passé):
j'allait parler - I was just about to speak