Will or going to ...

Can we say : I will be going to do some shopping tomorrow ?

Good question.

Where is everybody ?
All in vacation ?

Yes, you can say that. But in that sentence, the "going" is used as a participle in the sense of moving or traveling, not as the future tense indicator.

When do you use this kind of future :
I'll have finished my work tomorrow.

This is used when referring to something in the future that is relatively in the past in reference to another future event you are trying to describe.

For instance, "By the time I go to the concert this weekend, I will (I'll) have finished my homework."

This is not a common colloquial construction in English anymore (at least American English). Instead, people swap around "finshed" and "my homework" so that the sentence becomes:

"By the time I go to the concert this weekend, I'll have my homework finished."

This is not technically correct English, but it is used by English language speakers so they will not have to use the cumbersome "will have" construction.

Note that saying "I'll have my work finished by tomorrow" is a perfectly correct sentence but has a different connotation to it.

Ryan

Thanks Ryan . Are you a teacher ?