Of course, English is more than just memorizing grammar rules, the grammar must be incorporated into the everyday use of the language, theory and practice should go hand in hand. For more information on grammar check out our grammar page . If I had 1DM for every time I hear that question I could give up teaching. The answer is it varies, it depends on a variety of factors. You can't give accurate time frames for learning.
People vary in abilities, motivation and readiness to learn.
Classes should be tailored to the linguistic, cultural, and academic learning needs of the learner. No, English grammar is not half as difficult as some other languages, such as German. We have the French to thank for that. In 1066 he bought with him to England the ability to build impressive castles and the French language. Unfortunately the answer to this question is yes.