Ответы и объяснения

If you pass the exam, you ll get a certificate
If you fail the exam, you can do it again
If you don't want this magazine, I ll trow it away
If you want this pictures , you can have them
If you are busy now, we can talk later
If you are hungry , we can have lunch now
If you need money , I can lend you some
2 I give
3 is
4 I ll call
5 I ll be surprised
6 will you go if they invite