“Let him who would enjoy a good future waste none of his present.” - Roger Babson

English grammar doesn’t have a future tense like other languages. Instead modal auxiliaries, present tense and past tense forms and and adverbials are used to express future time.

Adverbial - a word or group of words functioning as an adverb.

He is going to read the book.

He is about to read the book.

I will begin reading the tomorrow.