She promised me that she (to ring up) me as soon as she (to return) from London.
She (to tell) me that the plane (to take off) at exactly 5 o'clock.
I learned that she (to get) a parcel from her parents one of these days and (to be going) to tell her about it.
I think that there must be:
She promised me that she would ring me up as soon as she returned from London.
She told me that the plane takes off at exactly 5 o'clock.
I learned that she will get a parcel from her parents one of these days and is going to tell her about it
but I'm not sure about the tenses with "as soon as". In the second one, I know that with the scheduled actions we use pr. simple but what about the first part where we have past simple? Is it possible to mix the tenses? And in the 3rd we have "learned" in past and then "these days" which is future.