1. Stop! You …………….. go. (can / can’t)

2. Danger! You ………….. enter. (can / can’t)

3. Go! You ………..… go. (can / can’t)

4. Bicycle! You ………… ride a bike. (can / can’t)​

1. Stop! You can't go.

2. Danger! You can't enter.

3. Go! You can go.

4. Bicycle! You can ride a bike.

1. can't

2. can't

3. can

4. can

  1. a final group of utilities worth mentioning is designed (present simple passive) for backing up and cleaning up hard disks.2. a data base is (present simple) simply a collection of date that is stored(present simple passive) on one or more computers. 3. the operating system must first be loaded(present simple passive with modal verb) into primary storage.4. multitasking capabilities were once found only on minicomputers and mainframes. (past simple passive)5. utility programs monitor how often and how quickly an application program is being executed compared to all the other programs in the system at the same time. (present simple; present continuous passive)