=>
1. Should she stay at home, I will come over.
-> đảo ngữ câu điều kiện loại 1 : Should S V, S will V
2. Were she to come, I would phone you.
-> đảo ngữ câu đk loại 2 với động từ thường : Were S to V, S would V
3. Were I you, I'd study harder.
-> đảo ngữ câu đk loại 2 với động từ tobe : Were + S + O, S would V
4. Had he told the truth, I would have forgiven to him.
-> đảo ngữ câu đk loại 3 : Had S V3/ed, S would have V3/ed
5. The test was not easy enough for me to do.
-> be adj enough (for sb) to V : đủ...để
6. She is too young to get married.
-> too adj to V : quá...đến nỗi không thể