I didn’t drown because my instructor knew how to help me.
$\Rightarrow$ Had ______________________________________________
I didn’t drown because my instructor knew how to help me.
$\Rightarrow$ Had ______________________________________________
Câu hỏi mới
$\rightarrow$ If + S1 + had + past participle, S2 + would/might/could … + have + past participle
→ If + S + had (not) + V3/ed, S + would/might/could … + have + V3/ed.
=> Had + S + (not) + V3/ed, S + would/might/could … + have + V3/ed.