Latin has six main tenses: three non-perfect tenses (the present, future, and imperfect) and three perfect tenses (the perfect, future perfect, and pluperfect). In technical language, the first three tenses are known as the īnfectum tenses, while the three perfect tenses are known as perfectum tenses. The two sets of tenses are made using different stems. For example, from the verb dūcō 'I lead' the three non-perfect tenses are dūcō 'I lead, I am leading', dūcam I will lead, I will be leading}, and dūcēbam 'I was leading', made with the stem dūc-, and the three perfect tenses are dūxī 'I led, I have led', dūxerō 'I will have led', and dūxeram 'I had led', made with the stem dūx-.