1.I was not tall enought to reach the shelf. (TALLER) 2.If you do have any free time, could you give me a ring (WOULD) 2.If you harry up , you won not be late (GOING) 3.If you are in London by any chance, come and see me (HAPPEN) 4.Please take a seat, and i will inquire for you. (WILL) hi vọng các bạn giải thích rõ từng câu giúp tớ ạ