1) She doesn't work here and that is why she can't enter without a pass.
IF
2) I advise you to stop eating junk food.
WOULD
3) What would you do if you won the lottery?
TO
4) She took a coat because she feared it might get cold.
CASE
5) If Sara weren't ill, she would go with us to the mountains.
BUT
6) Diane wants to phone her uncle but she hasn't got the number.
HAD