1) I have looked for him since I finished my lesson. 2) They are discussing the problem for hours, but has not solved

1) I have been looking (Present Perfect Continuous) for him since I finished my lesson. 2) They have been discussing (Present Perfect Continuous) the problem for hours, but have not solved (Present Perfect) it yet. 3) Look! Somebody has broken (Present Perfect) the window. 4) Is it still raining? — No it has stopped (Present Perfect). 5) John has won (Present Perfect) the championship two times. 6) The boy have been fishing (Present Perfect Continuous) for 3 hours.