Neither of your sentences are correct. We use 'any' in negative sentences and questions. For example: I can't understand any English. / Can you understand any English? In affirmative sentences, we use 'some'. "I can understand some English". 'many' doesn't work in your sentence. We use 'many' with countable nouns. You could say "I can understand many English speakers", for example. (English speakers = people who speak English as a native language). I hope that helps!

Neither is right. Do you mean "I can understand a lot of English, but I can't speak so much"? We can only use 'many' for things that we can count - 'many' is the equivalent of 'muitas (coisas)' . For more abstract things that you can't count ( the equivalent of 'muito/muita') we use 'much' for questions and negatives, and phrases like 'a lot of' for affirmative statements. 'Any' is more or less the equivalent of 'algum' in Portuguese. Espero que isto ajude.