Learn Turkish: Gramer öğrendiğimiz sömestir çok hızlı geçti. - The semester we learned grammar passed very quickly.

In Turkish, the -dik participle isn't just used for direct objects (like "the book that we read"). It is also used to modify nouns of time and place. So, "the semester when we learned grammar" is built using the exact same structure: Gramer öğrendiğimiz sömestir.

Why is it Gramer and not Grameri if it is the object of what we learned?

We only use the accusative case marker (-i / -ı / etc.) for specific direct objects. Here, the sentence talks about learning grammar in a general sense, not "the specific grammar." When a general, non-specific object sits right next to its verb—even inside a relative clause like this one—it stays in its plain dictionary form.

What happened to the -dik suffix in öğrendiğimiz?

The base participle suffix is -dik. To show who did the learning, we add the first-person plural possessive ending -imiz (our). When the k at the end of -dik is sandwiched between two vowels, consonant mutation forces it to soften into a ğ (soft g), resulting in öğrendiğimiz.

Is sömestir the only word for "semester", or is there a native Turkish equivalent?