можете написать эти предложения в трех формах
1) if the teenager ... (collect) his thoughts, he ... (win) the competition.
2) if you ... (learn) German, you ... (stay) out of trouble.
3) if they ... (take) care of their pets, the poor puppy and kitten ... not (get) into trouble.
4) if we ... not (rely) on him, we ... not (be) late.
5) if the girl ... (lay) the table, her aunt ... not (be) angry with her.

1) If the teenager collect his thoughts, he'll win the competition.
If the teenager collected his thoughts, he would win the competition.
If the teenager had collected his thoughts, he would have won the competition.
2) If you learn German, you'll stay out of trouble.
If you learnt German, you would stay out of trouble.
If you had learnt German, you would have stayed out of trouble.
3) If they take care of their pets, the poor puppy and kitten won't get into trouble.
If they took care of their pets, the poor puppy and kitten wouldn't get into trouble.
If they had taken of their pets, the poor puppy and kitten wouldn't have got into troubles.
4) If we don't rely on him, we won't be late.
If we didn't rely on him, we wouldn't be late.
If we hadn't relied on him, we wouldn't have been late.
5) If the girl lay the table, her aunt won't be angry with her.
If the girl laid the table, her aunt wouldn't be angry with her.
If the girl had laid the table, her aunt wouldn't have been angry with her.