I think the verb is "Present Continuous". What do You think?
Yes, it is Present continuous but if I write a letter every day I have to use the Present Simple.
Are you agree?
I can say too: Past Participle: I've written a book.
Past Simple: I wrote a book yesterday.
When Have I to use the past, and when the past participle? Can you make an example please.
U have to use simple past when the period of your action (about what u want to say) is ended. For example, i went to the cinema yesterday.
If the period is not ended u have to use past participle. For example, i have been in cinema today.
He burns his hands in the fire.
He burnt his hands in the fire.
He has burnt his hands in the fire.
I buy my house
I bought my house