1)
Logical operations performed (причастие II – Participle II, определение) by a
computer are comparing, selecting, sorting, and determining.
2)
The input unit consists of some devices using (причастие I – Participle
I Simple, определение) different means.
3)
Discussing (причастие I – Participle I Simple, обстоятельство) the advantages of the new memory
unit the professor gave the students all the necessary explanations.
4)
Having punched (причастие I перфектное – Participle I Perfect, обстоятельство) holes in a card the operator put it
into the computer.