This is a grammar question. Which of the following is the correct way to say this phrase - or please let me know if two or more are correct - ? 1. `A screwdriver is for driving in screws with.´ 2. `A screwdriver is to drive in screws with.´ 3. `A screwdriver is for driving in screws.´ 4. `A screwdriver is to drive in screws.´ Please, pay attention to the underlined words, which are the ones concerned in this thread. Thanks a lot in advance.