Проверьте 1)if i was not so busy now, i would go with you 2) why she would not tell me about it, even if she had knew? 3) i would happy, if i found job like your. 4) if i were you, i would learn german огромное

1) If I were not so busy now, I would go with you. - на твоем месте - If I were you

2) Why  wouldn't she tell me about it, even if she had known?- при вопросе вс глагол ставим перед подлежащим

3) I would happy, if I found job like yours. - абсолютное местоимение

4) If I  were you, I would learn German. - I всегда пишем с заглавной буквы