This is the 37th most frequent Russian word.
когда
The Russian word "когда" means "when" in English.
In this sentence, "когда" introduces a temporal clause, referring to the specific time when the action will occur.
Когда ты придешь, мы начнем ужин.
When you come, we will start dinner.
In this example, "когда" refers to a period in the past, functioning as an introductory word for a description of past events.
Помнишь, когда мы были на море?
Do you remember when we were at the seaside?
Here, "когда" is used to indicate the point in time of the expected action within a subordinate clause, introducing indirect speech.