by the time (follow-up question)

[SARDORBEK]

Dear TEACHER!

I am continue the subject that has been brought up in one of my previous questions
so as to learn more about this. Your help would be appreciable.

(a) By the time you get back, I will have tidied up.

(b) I will have finished my homework by the time I go out on a date tonight.

(c) The film will have started by the time they get to the cinema.

(d) I will graduate in June. I will see you in July.
By the time I see you, I will have graduated.

In all four sentences, can the verbs conjugated in future perfect be alternative to
those conjugated in simple future? Or which one can be and which one cannot?


Sincerely,
SardorBEK

[Alan]

All correct and natural as written.