1. What were you up to at 8pm last night?
2. Are you at home now? What are you doing? 
3. What are you doing next Saturday morning at 8am? I could like to get a coffee with you. 

1. What were you doing yesterday night at 8 o'clock?
2. Are you at home right now? What are you doing?
3. What are you doing at 8 in the morning next Saturday? I want to drink coffee with you.

1) What were you doing last night at 8pm? 
2) Are you at home right now? What are you doing? 
3) Next Saturday morning at 8am what will you be doing. I would like me and you to drink coffee.

What were you doing at 8:00 last night?
Are you at home? What are you doing?
Next Saturday morning at 8:00 you can do what? I want to drink coffee with you

1. Last night at 8 o'clock, what were you doing? 昨天晚上我跟朋友聊天。
2. Are you at home right now? What are you doing? 对，我在作家。我在吃早饭。
对，我在家。
3. Next Saturday morning, what are you doing at 8am? I want to have coffee with you. 下个星期六上午8点我打运动。 你想喝咖啡跟我在10点吗？
做运动。10点的时候，你想跟我喝咖啡吗？

1. what did you do at 8pm last night?
2. are you at home now? what are you doing?
3. 8am next Saturday morning, what will you probably do? I want to go for coffee with you.

正确

1. What were you doing at 8PM last night?
2. Are you at home now? What are you doing?
3. What will you be doing at 8AM next Saturday? I want to have coffee with you.

correct 

1. What did you do at 8pm last night?
2. Are you have home at home right now? What are you doing?
3. What do you want to do next Saturday at 8am? I want to drink coffee with you.

1. Yesterday 8 PM at night you do what?
2. You're at home now? You are doing what?
3. Next Saturday 8 in the morning you do what? I would like to drink coffee with you.

correct

1. At 8pm yesterday what were you doing? 
2. Are you at home at the moment? What are you doing? 
3. What  will  you do on Saturday at 8pm? I want to drink coffee with you.