Grammar - Mixed Conditional

Rewrite the sentences, beginning as shown, so that the meaning stays the same. Put in commas where necessary. EXPLANATION
1) I feel terrible because I lost my smartphone yesterday.
If I
so terrible.
2) The 12.45 train left on time, so Decker will be in Berlin by now.
If the 12.45 train
in Berlin by now.
3) Peter spent his childhood in Germany so he speaks German very well. (if)
his childhood in Germany.
4) You're not an efficient employee, so you weren't promoted.
If you
5) He was playing computer games all night so he is tired now.
If he
tired now.
6) She didn't study medicine. That's why he isn't a rich woman now. (if)