для предложений употребите Future Continuous руководствуясь моделью :
I was working at 2 o'clock yesterday.
I shall be working at 2 o'clock tonight.

Предложения следующие :
1)He is going to Mr. White
2) I was staying at my friend's place all day long yesterday.
3) They were having supper at that time.

1. He will be going to Mr. White.2. I shall staying at my friend's place all day long.3. They will be having supper all the time.