Посмотри на следующие фразы искажив каких из них говарится отом что происхотит обчно ,а в каких о том ,что происходит сейчас.mary and ann are swimming.

Mary and ann are swimming-действие происходит сейчас

Simultaneously with the creation of private copies of viruses can harm: to destroy, to damage, to steal data, to reduce or completely prevent further operation of the computer operating system. 2. harmless viruses do not interfere with the operation of the computer, but reduce the amount of free ram and memory on the disc; the actions of such viruses appear in any graphic or sound effects. 3. the most common kind of “trojans” is widely known programs use (editors, games, translators), which are embedded in the so-called “logic bombs” that are triggered in case of occurrence of some event. 4. compared with viruses trojan horses are not widely spread due to quite simple reasons, they either destroy themselves together with other data on the disk, or unmask their presence and destroyed by the user. 5. known viruses are invisible which are very difficult to detect and neutralize, as they intercept treatment operating system to the affected files or sectors of disks and substitute uncontaminated areas of the disk.