I am not a skilled teacher, but I hope I can help you. Since you want help, please let me correct the tense of your question first. "These tenses are very confusing to me" That is the correct way to say that, because it is a continuing action. Present perfect: (subject) has/have (past tense verb) I have You have She has He has Bob has Jane has No one has Everyone has "has" is almost always the case except with "I" or "You" After that is a past tense verb such as "Been" or "Had" or anything Ex: I have been to the United States. Have you been to the United States? Jane Has been to the United States. There are cases where English breaks the rule such as "Eaten" instead of "ate" I have eaten mashed potatoes. To make it a negative tense use "never" or "not" after "Have" "Has" I have never eaten mashed potatoes. I have not eaten mashed potatoes. Hope this helps!!

I know English . Can you teach me Portuguese?

Is The present perfect used to discuss events that have just been completed at the moment of speaking? Ex: I have just finished my homework

can you specify your problems more examples can help us to provide you more appropriate suggestion