The layers of the atmosphere differ in temperature and density.
To be a good prince you have to put your people before anything
When Jack decided to sit with with Auggie at lunch his friends did not like that because Auggie was considered the "Freak" of the school.
For this-if you know what you want to do with your future- you just write about what you want to achieve.
The subjunctive mood is the best.
The subjunctive is rarely used in colloquial English. Totally irrelevant information, but... it is a relic from Latin, where there are many uses for a subjunctive. There is even a special conditional using the subjunctive mood that expresses the exact circumstances you described, which is usually called future less vivid.
