The verb <em>"decir"</em> in its form <u><em>"decimos"</em></u> has the conjugation owned to the second person in Present Tense how you could see below:
The form <u><em>"decimos"</em></u> is the conjugated form in Present Tense for the personal pronoun <em>"nosotros,"</em> the conjugated form in preterite and indirect preterite form for that personal pronoun is <em>"dijimos"</em> and <em>"decíamos"</em> respectively.