Hello Seyda, This is a third conditional sentence - Hypothetical because the action takes place in the past and you can't change the past. The form is "If + past perfect, would + have + past participle" In this sentence you didn't know she was coming so you didn't come. Hope this helps Bob

I'd have = I would have

Meaning in Turkish: (Eğer) Onun geleceğini bilmiş olsaydım, ben de gelirdim. Tabii buradaki 'O' bir bayan (she) I'd have= "I would have" Anlamı: would have kalibi "(o durumda) x yapardim ederdim. Başka bir örnek: - If I had seen him, I'd have greeted him. - (Eğer) Onu görmüş olsaydım, selam verirdim. Ümarim anlata bilmişimdir

You learn this grammar at the end of intermediate level. Look for "third conditional" (yes, you need to know this). We often use "would" as a modal for imagined actions. "Would have" is the imagined past, and that suggests the action didn't happen. "I'd have come" = "I didn't come" (in reality).