1. Future forms I WILL go to Scotland this summer. = no special plan
I am GOING TO go to Scotland this summer. = intention
I am goING to Scotland this summer. = st. already arranged
Phrases: We´re hoping to go ... (intention)
I´m planning to go... (intention)
The plane is due to take off at ... (arrangement)
Jill´s about to have a baby. (close future)

2. Future clauses
if, when, as soon as, before, unless, until + present tense I will do it if / when / as soon as / before I come home. I will not do it unless / untill he brings the money. I will be tired unless /untill I get more rest.