The food will be finished ... Meghna arrives.
before
She was talking on the phone ... I arrived.
when
I will leave ... he comes.
before
... anyone realised what was happening, the criminal had escaped.
Before
Don't use a mobile phone ... you're riding a bike.
while
... it stops raining, we will leave.
As soon as / When
The detective waited ... the criminals had left the building.
until
She began cooking ... I was finishing my homework.
while
... the guard was talking to the woman, the burglars broke into the bank.
While
... I see her, I say hello.
Whenever
... I hear from Tom, I will give you a call
As soon as
We phoned the police ... we saw the broken door.
as soon as