Hello everyone!!! I have a doubt. How can I use either and or in a setence?

Hello everybody. I need help about this question. :) What is right? We can talk on 7am. or we can talk in 7am. Thank you to reading. Best wishes. :)

Hello everyone!!! I have a doubt about this sentence. Someone can help me? You are 6 hours ahead of me or You are 6 hour ahead of me. and why? Thank to reading. Have a nice day. :)

Hello everyone. I need help when I can use "Get" and when I can use"Take". Thank you for your helping. Have a nice day. :)

Hello Folks!!! Help me to corrige these sentences.:) 1- I have never been in her Math classes. 2- He has been in his grandfather's house since the last week. 3- They have worked in at Apple more than one year. 4- Have you awaked, when the Fabio called? 5- Have they built the building, before the houses?