Решение:
Заполняем вопросы, используя вторую форму глагола в первой части (if-clause) и would + инфинитив во второй части (main clause).
- you saw (see) a road accident?
- your friend gave (give) you a present that you didn't like (not like)?
- you could (can) speak perfect English?
- you knew (know) that a classmate was cheating in an exam?
- you broke (break) your friend's mobile?
- you found (find) €100 in school?
Ответ: 1. saw; 2. gave, didn't like; 3. could; 4. knew; 5. broke; 6. found.