I need your help ..

Please I wanna your opinion Read this answer : ( (1)two languages in the same modality , for example two speech-based languages such as spoken English and spoken German . (2) two languages based on different modalities .e.g. spoken German and American sign language.)   And what do you think .. It can be answer for any questions of these .. Or it can be for both .. *Two essential  conditions to become bilingual .... *A person is bilingual if he or she knows     Thank you ..