Yes, it should look like this "eye speaks verry goodd englisch". No, really, I don't have a sample letter but you know it's not recommended that you do English proficiency by letter unless English is your first language and if English is your first language, it should be no problem for you to type one up. They might not believe you anyway if they saw you just used a form letter off the web. Just make it short because some guy on here said his got lost in his 10 page essay of a cover letter so they asked him again anyway.