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I don't agree. English native speakers are a people that find difficult to learn any language, except their own. May be it is a consequence of the English grammar simplicity!
If you read NUMBERS in the middle of a foreign language text, how do you say them? I tend to read them in my first language instead of the text's language!
@jlawler: If it came to Portuguese it would be: eu i, tu iste, ele iu, nós imos, vós istes, eles iram. And it is exactly equal to the perfect preterit for the regular verbs of the 3rd conjugation (ex: eu parti, tu partiste, ele partiu, nós partimos, vós partistes, eles partiram). It is a pity it has not survived in this form; it would be much more regular and distinct from the ser verb's perfect past tense.
English has not complicated tenses (3 tenses) and verb conjugation flexes very little inside each tense — compare with latin languages ... I can speak fluently Portuguese, Spanish, French, Italian, English ... I know what I am talking about.