1/ has increased - present perfect active voice
2/ are discussing -present continuous active voice
3/started- past simple active voice, had retired -past perfect active voice
4/spent- past simple active voice, was raining- past continuous active voice
We have carefully studied (Participle II - часть сказуемого) all the technical data that we got from you
The machine tool advertised(Participle II - определение) by Brown and Co will be in great demand on the market.
By 5 o’clock they had cleared (Participle II - часть сказуемого) up all the points in the firm’s offer.
Peter saw her at the University library when he was working (Participle I - часть сказуемого) for his final examinations
