1) Look! Peter is staying at the back door. (Present Continuous)
2) We have missed the bus. Now we'll have to walk. (Present Perfect)
3) How long have you been here? (Present Perfect)
4) I have been looking for my keys all the morning but I haven't found them yet. (Present Perfect Continuous, Present Perfect)
5) Modern trains go very fast. (Present Simple)
6) He will go to the cinema next weekend, I think. (Future Simple)
7) Ann likes playing tennis. (Present Simple)
8) My parents bought a delicious cake yesterday. (Past Simple)
9) I have been writing a letter for 2 hours. (Present Perfect Continuous)
10) Helen is dancing now. (Present Continuous)
11) Sam has already fed the kitten. (Present Perfect)
12) Nick doesn't read books every day. (Present Simple)
13) Alice and Den were at the cafe yesterday. (Past Simple)
14) The doctor prescribed a medicine to my granny two days ago. (Past simple)
15) Our town is nice and green. (Present Simple)