Mission 2.6
IF/WHEN: Present instead of Future
Simples.

If a sentence
1. refers to the future and
2. has IF or WHEN in it,

then in the IF/WHEN part instead of the future tense we use the present tense.

When I get home, I'm going to eat everything in the fridge.
If I don't feel better tomorrow, I won't go to work.
If you're late, we can wait.
When you leave, please turn off the lights.

1.
WHEN indicates time. Hence, the same will occur with other conjunctions that indicate time.

Note that all of the examples refer to the future.

I can only come after I finish work.
AFTER

BEFORE
Kiss me hard before you go.
UNTIL
He's going to wait here until you give him an answer.
AS SOON AS
Call me as soon as you arrive.
WHILE
I'll talk to him while I'm visiting the exhibition.
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IF points to condition. Hence, the same crap will occur with other conjunctions that point to condition.

The examples are about the future again.
2.
UNLESS
They will be on time unless they miss their train.
AS LONG AS
She can stay here as long as she doesn't say anything.
IN CASE
Take an umbrella in case it rains.
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УЧЕНИЯ
'What's your name?' 'David.'
'Are you married?' 'No, I'm not.'
'How old are you?' '25.'
'Are you a student?' 'Yes, I am.'
'Am I late?' 'No, you're on time.'
'Is your mother at home?' 'No, she's out.'
'Are your parents at home?' 'No, they're out.'
'Is it cold in your room?' 'Yes, a little.'
Your shoes are nice. Are they new?
Is she at home? / Is your mother at home?
Are they new? / Are your shoes new?
Practice makes perfect:
FIELD PRACTICE