Употребить время презент перфект континиус: 1) Я не могу найти свой телефон, поможешь мне отыскать? 2)Он сидел на крыше

1) I can not find my phone, will you help me find it? 2) He was sitting on the roof and looking at the evening sky. 3) Let me have a look at your laptop. 4) Beware, angry dog. 5) I studied this two years ago. 6) He looked back to see who was laughing so long. 7) In September I always wait for the next summer already.