Couldn't we use "you all" or "y'all" as the plural form of "you" in English? It could help clarify singular v.s. plural "you", making their counterparts in other languages easier to learn. Some dialects of English, such as Southern USA, do use this plural form "y'all" regularly. I think "you all" and "y'all" ought to at least be acceptable answers for "you" plural.
In the basic skills portion, section 2, it asks you to chose an option. Occasionally (towards the end of the section we are only provided with one option to check off. This option is one for the wrong answer only as it incorrectly offers the wrong gender corresponding annswer. Due to this problem I cannot advance in the lessons. I am enjoying your lessons very much and hope that you correct this soon. Toda rabah!