1. I think you are to delete the second paragraph.
2. The secretary was to email the letters to the clients yesterday.
3. Users have to enter a password to gain access to a network.
4. The method of this experiment isn't correct. We will have to repeat the experiment once again.
5. A new program has to be written for these specific calculations.
6. The BBC had to respond to more than 300 phone calls after last night’s programme.
7. You will have to check the figures one more time – we don't want any mistakes.
8. To install the software, first you have to load a small installer program to your machine.
9. We were to delay the meeting because the documents were not ready.
10. To activate a peripheral device, the user is to install a specific driver.
11. That security guy never recognizes me. I always have to show him my ID.
12. After loading the software, you are to restart the PC.