Yet often means until now. We use it for something that has not happened before this moment. It often shows that the speaker thinks the thing may happen later.

In negative statements, yet shows that something is not true up to now. It is common with the present perfect, but people also use it with other forms in everyday English. The idea is that the situation may change later.

In questions, yet asks if something has happened before now. It often shows that the speaker thinks the answer may become yes later. This use is common in everyday English.

Yet usually comes at the end of a clause or sentence. This end position is the most common pattern with negative statements and questions. Other positions are less common for this learning target.

Yet overlaps with still and already, but they are not the same. Yet looks back from now and says something has not happened before now, or asks if it has happened. Still says a situation continues now. Already says something happened earlier than expected, but in some questions native speakers may choose already or yet with a small difference in meaning.

Word or Phrase	Definition
yet	It means up to now in negatives and questions, often with an idea of later change.
still	It means a situation continues now.
already	It means something happened before now, often earlier than expected.

Yet also appears in short answers and common everyday phrases. In these phrases, it keeps the idea of up to now. It often suggests that the answer may change later.

Word or Phrase	Definition
not yet	It means no up to now, with possible change later.
have not yet	It means something is not done up to now.
has not yet	It means something is not finished or not true up to now.

You can now use yet to talk about things that have not happened up to now. You can use it in negative statements and questions, usually at the end of the clause. You can also see how yet differs from still and already, even when speakers make different choices in some cases.