The Smiths' train ....... (arrive) at 6.30, we must be ready!
ARRIVES = Present Simple, timetables and schedules
She .......... (call) us as soon as she reaches London.
WILL CALL = Future Simple, future prediction, future fact; Present Simple: used to talk about a condition of time in the future, after as soon as/by the time/wh
By the time you wake up I......... (already leave) for school.
WILL HAVE ALREADY LEFT = Future perfect, to talk about an action that will be completed by some moment/ other action in the future.
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