English native speakers !! Hello friends! The following sentences are basically quite simple, just tell me if they are gramatically correct and if they "sound English", I mean, If a native speaker would write the same sentence as I did. Thanks! 1- Now Tom is playing violin in a juvenile orchestra 2-They will let us go as they check our documents 3- Are you eyes hurting when you spend much time staring at your PC's screen? 4-When are you thinking to go skiing? 5-Look at this cloudy sky? 6- He must have studied hard for his exam since he got a high mark 7-Carlo felt asleep while he was having dinner 8-It was an amazing sempter day and the birds were singing in the garden 9- Filippo used to be a teacher while now\ currently he holds a job on its own 10-Yesterday has Clelia won? No? So who( has?) won? 11- The house was built on\ during 1980 12- I've been waiting for 15 minutes when I met him 13-You could have phoned him to tell what you've decided 14- Oslo is colder than Florence 15- Daddy, could you please buy me an agenda in the bookshop? 16- If the children were less noisy\ loud, I could go on with my lesson 17- If you had called Francesco, nothing bad would have happened 18. She hoped that her party will be great 19. We've been playing\played together for 3 years 20. Please, you should switch off your mobile