I AM / DO / HAVE he/she IS / DOES / HAS you/we/they ARE / DO / HAVE

Sometimes it just helps to see a lot of examples: I have five books. I am tired. I am typing. I am hungry. I am a pianist. I have piano skills. I do like green egss and ham. She has five books. She is tired. He is typing. He is hungry. She is a pianist. She has piano skills. She does like green eggs and ham. They have five books. They are tired. They are hungry. They are pianists. They have piano skills. They do like green eggs and ham. You have five books. You are tired. You are typing. You are hungry. You are a pianist. You have piano skills. You do like green eggs and ham. We have five books. We are tired. We are typing. We are hungry. We are pianists. We have piano skills. We do like green eggs and ham. The second answer you received (posted by Tish) puts all this very well. "Green Eggs and Ham" is a children's book by Dr. Seuss. Reading books like this and of the same level will help you more strongly define your sense of basics like what you're asking about. Reading these children's books will be more fun than reading the grammar books. Grammar books will be more fun when compared with children's books.

http://www.learnenglish.de/grammar/verbtohave.html http://www.learnenglish.de/grammar/verbtobe.html http://www.learnenglish.de/grammar/verbtodo.html Even with these helpful sites, you simply must practice. I've learned one language besides English and am learning another and I can tell you from experience that, besides a good reference, practice is the only answer.

Don't worry about your problems. Chinese doesn't have conjugations. I have problems with Chinese for the same reason. Here are some conjugations for the present tense in English. To be To have To do To swim I am I have I do I swim You are You have You do You swim He/she/it is He/she/it has He/she/it does He/she/it swims They are They have They do They swim To swim is regular. For regular verbs, the I, you, and they forms are just like the infinitive (to + verb) without the 'to'. The he/she/it form adds an 's'. There are more rules concerning spelling and irregular verbs, but this explanation is basic.

If you can't tell the difference between words, then you can't learn the language.