giup tui voi mng oiiii

`1,` Should we go by train, it will be cheaper

- Đảo ngữ - ĐK loại `1`: Should + S + (not) + Vbare-inf, S + will/can/shall + V

`2,` Were I to have a map, I woul lend it to you

- Đảo ngữ - ĐK loại `2` : Were + S + (not) + to Vbare-inf, S + would/could/should + Vbare-inf ...

`3,` Had he had tell you, he could helped you

- Đảo ngữ - ĐK loại `3` : Had + S + (not) + P2, S + would/could/should + have + P2

Đảo với câu đk loại 1: Should+S+(not) V, Mệnh đề giữ nguyên

Đảo với câu đk loại 2: Were + S + (not) + (to V1), S + would/might/could… + V1

Đảo với câu đk loại `3`:Had + S + (not) + V3/ed, S + would/might/could… + have + V3/ed

`1`Should we go by train, it will be cheaper

`2`Were I to have a map, I would lend it to you

`3`Had he told me, he could have helped you.