Omission of the “s” in the third person verb: this is one of the most typical mistakes for an Italian and a Spanish speaker. Even if you know the very simple rule, the mistake is so common.
Gender confusion: In Spanish and Italian with the verb you can understand the person you are referring so the subject is not essential. It's probably for this reason that Spanish and Italian speakers make this type of mistake.
Spelling: the sound of the English vowel “E” is the equivalent of the Spanish and Italian “I”. It's very typical to change this two letters when someone spells a sentence. There are also some words with the same sound but a different spell (buy/bye/by)
Pronunciation: the most difficult sound to pronunciate is the “TH”. There are no words with this type of sound, in which you have to put the tongue between the teeth.
Verbs. There are some verbs that are transitive in English but intransitive in Spanish or Italian.
Literally translations. The most common mistake is the verb agree. The literally translation is “ estoy de acuerdo” or “sono d'accordo”. So it's usual to use the verb agree with the auxiliar verb to be.
TIPS FOR LEARNING ENGLISH
Keep calm and Speak English. There is non need to rush. Learning a new language is a long process and the more you worry about it the worse it is. The most important thing is speaking and not being afraid of make mistakes. It's normal and makin g mistakes is the best way for knowing in which you have to do more work.
Using a grammar book for learning the main rules is essential for the begin of your studying, but then the most important thing is practice.
having a notebook is very important for writing your note and new words that you learn everyday;
listening to the music and translating the lyrics is effective;
watching a movie is very helpful too, in particular a movie that you've already seen it or with the English subtitles.
Stop translating words by words. English is a different language. The best way for learning a new language is to tray to think in that language. Of course it's not easy and for this you need a lot of patience, but the structure of a sentence and the meaning of a verb might be different.
Set small goals for every day. For example:
learning 10 new words each day;
read the paper every morning;
try to listen more than one time a different song;
watch a serie tv with english subtitle;
watching TED talk is very helpful and they are online-
Having a goal every day is important to get more familiarity with the language for learning faster new words and how a sentence is structured.
Learning a new language is a great psychological job, so patience and believe in in yourself are essential in your daily work. Never give uo and the sentence “I don't speak English” doesn't exist. “Could you repeat please?”, “I'm sorry I didn't understand, Could you speak slower, please?” are perfect for trying to understand even if you have ask this a lot of times. So be patient and work hard!!!