Can you read old English masterwork such as shakspere?

I've never tried to but I have tried it with portuguese and it is really hard to understand.

Shakespeare isn't really that difficult for a modern English person to understand. There are some words which have fallen out of use and some which have changed their meaning and the syntax and word order may be unfamiliar but an English person of today would have been able to converse with an Englishman of the 16th Century quite easily, on the whole. On the other hand, Chaucer, writing some 200 years earlier is very difficult for a modern English reader to understand without a glossay and the author of Piers Plowman, who wrote at about the same time as Chaucer is almost entirely different from the English we know today because he came from a different part of the country where the French influence on English had not reached. The reason that ancient Chinese is still fairly easy to read is that Chinese uses ideograms which do not indicate the pronunciation of words at all and may, in fact, represent words which are not even linguistically similar. I knew a man who could not speak a word of any Chinese language and yet could read and understand modern Chinese fairly fluently because he knew the meanings of the ideograms in English. I doubt very much that any scholar today would find it easy to understand any Chinese language as it was spoken 2000 years ago, though the written language has remained much the same.