To have means to possess or own something. When you have a bicycle, it belongs to you. When you have three dollars in your pocket, that money is yours to spend. You can have physical things like books or toys, but you can also have experiences (“I had a great time at the party”), responsibilities (“I have homework to finish”), or relationships (“I have two sisters”).

The word is one of the most useful in English because it works in so many situations. You can have an idea when a thought occurs to you. You can have breakfast when you eat your morning meal. You can have trouble with a difficult math problem. You can have permission when someone allows you to do something.

Have also teams up with other verbs to show that something happened in the past and still matters now. When you say “I have finished my project,” you're explaining that you completed it earlier and now it's done. When you say “She has lived in Chicago for five years,” you mean she moved there in the past and still lives there today. This use of have (called the present perfect tense by grammar experts) connects the past to the present moment in a way that the simple past tense doesn't quite capture.