英文語法種類有幾多？

Well, just to express different shade of times, they have 12 different tenses, and then there are other stuffs, like part of speech, sentence structures, subject and verb agreement etc. So it's lot. and for non speakers, specially orientals, i think, it would take years and years to learn English because the grammars are so different. But it's definitely more differcult for westerns to learn for example Chinese, because our language has different tones, like Mandiran has 4 tones, English doesn't have that, and we have so many characters, it really makes learning Chinese harder for them, but some westerns still learn our language and like anything else practice makes perfect.