In the movie Taken 3 (2015), one character is looking at a text message on a mobile phone, and he says to another character:
Text from your phone asking mom to meet you at the rancho Berrego the night she died. Someone used your phone.
Why is the verb asking in this sentence in the -ing form?
If the verb, ask, is in the continuous tense, why is there no “to be”?
And why should we use present continuous here, and not the simple past?