In the “Sign in” webpage, we click on “Need help?”.
When clicking on there, another page will appear asking what is the problem. We select “I don´t know my password” and check that the email is well written below. Then click “Continue”.
You will be redirected to another page that asks you to enter the last password you remember (in case you changed recently your password), but we suppose you don´t remember any gmail password, so please click “I don´t know”.
When you registered your Gmail account, you had to enter an alternative email address. So you know now why this was necessary. In next page, Gmail says you to reset your password by going to the alternative address. Click “Continue”; but, what if you have deleted this email address? Then click on the second option. Some questions will be asked you to confirm you are the owner of this Gmail account. But in any case, you will have to give an alternative email address.
Option 1: you´ve clicked Continue. Now go to your alternative email address. Check the email from Google you received, click on the link, and now you will be requested to reset your password. It´s done.
Option 2: you have to verify your identity. Give an alternative email address. Then you will have to give some another information. If everything is correct, an email to reset your password will be sent to the alternative email you´ve given in this option.