Is it correct to say lectures began yet?

The phrase "lectures began yet" is grammatically incorrect. Here's why:

* Word order: The word order is wrong. We usually use the auxiliary verb "have" before "begun" in this context.

* Tense: The sentence is missing the correct tense. We need to specify if the lectures started in the past, present, or future.

Here are some correct ways to phrase the sentence:

* Past: "Have the lectures begun yet?"

* Present: "Have the lectures begun?" (This implies a recent past or continuing action)

* Future: "Will the lectures begin yet?" (This is less common, but it's possible to ask this)

Let me know if you'd like to explore more ways to express this idea!