g. calls to her number are failing to connect).
New words, one handy idiom, and a 2-minute quiz — delivered to your inbox to keep your streak alive.
It is stronger than "possible" -- normally it expresses the speaker's belief/assumption that she did not turn on her cell phone, or has not turned on her cell phone, based on indirect evidence (e.g. calls to her number are failing to connect).
deborahjeongShe must not have turned on her cell phone.
~ Given the evidence, it must be true that she did not turn on her cell phone.
Also stated as
She can't have turned on her cell phone.
~ Given the evidence, it can't be true that she turned on her cell phone.
CJ