Thank you, Clive, for your help..
You wrote:
Then, I will have eaten my dinner and have played tennis for a while. The Present Perfect makes it sound like you did this before 7pm. Is that what you mean? If so, say 'By then . . . '. When did you do these things? You came right home after school, didn't you? Yes, the actions should happened after my coming from school at 7 p.m. How should I word the next sentences if they came after my coming from school?
My uncle is scheduled to come home at 8 p.m. and when he comes home as scheduled, I will be doing my homework since it will take more then an hour but less than two hours to complete my homework. When my aunt comes home at 9:30 p.m., I will probably have finished my homework and will probably be rocking on my lazy chair while humming my favorite tunes and listening to the very song on a CD player from which the tunes came. I don't understand this last phrase that I've underlined. It might have been too long a sentence: I used the adjective 'very' to intimate the same occurance or ownership like "It is a song named "***" and it was a very song I listened to when I was here this very place last year"