Ellipsis

We often leave out words to avoid repetition or in other cases when the meaning can be understood without them. This is called ellipsis.

• Nice day, isn’t it? (= It is a nice day, isn’t it?)
• Seems we have a problem. (= It seems we have a problem.)
• Seen Ann? (= Have you seen Ann?)
• Doesn’t know what she is talking about. (= She doesn’t know what she is talking about.)