And if you don't read the grammar before participation is not clearly understood or may not be understood at all, so the translation, and read before the insight and understanding do not waste time read later.
And if not read before attending grammar will not understand or will not understand so I translated and read before will be fully understood and no time to read it later, too.
And if you don't read the grammar before class is not perfectly or may not understand that เลยดัง translated and read it before we can understand how perfectly and no time to read later.