Verb to be + To: Como utilizar

Várias vezes lendo textos em inglês me deparei com um verbo to be seguido de um verbo no infinitivo (ex. I were to tell...). Neste caso, a tradução seria: "Se eu fosse dizer"?
Aqui vai um trecho do texto para facilitar a compreensão:
"If ,for example, we say that " She is reading this comic". It will simply mean she is still on reading that comic, time is not here known though. However, If I WERE TO TELL the time also here, it would be said as" She has been reading this comic since morning". or "She has been reading this comic for last two hours."
Thanks.