English Grammar for proficiency: The Simple Future Tense.

The Simple Future Tense is a tense used to express events or actions that will take place in the future. It is usually used to indicate predictions, facts or immediate decisions about the future.

Affirmative	I/You/He/She/It/We/They + will + V1
Negative	I/You/He/She/It/We/They + will + not + V1
Question	Will + I/You/He/She/It/We/They + V1

	Example	Short Form
+	I will go.	I'll go.
	He will go.	He'll go.
−	She will not go.	She won't go.
	They will not go.	They won't go.
+?	Will you go?	––
	Will we go?	––
-?	Will you not go?	Won't you go?
	Will you not go?	Won't he go?

Usage

1. It is used to indicate an action that is decided to be done at the moment of speaking.

・I am very thirsty. I will drink water. 

・Someone is at the door. I'll go and open it.

・It's too hot today. I think I will go for a swim.

・What would you like to drink? I will have coffee, please.

2. It is used to express a prediction about the future, usually with the words 'think, guess, expect, believe, wonder, sure, probably, perhaps'.

・I think I'll be late tonight.

・I wonder what will happen.

・I'm sure you'll pass the exam.

・It will probably rain tomorrow.

・I don't think the party will be fun.

3. It is used to indicate a fact about the future or an event that is expected to happen.

・Winter will come again.

・He'll be a father soon.

・He will turn 18 next week.

・The train will arrive at 10:30.

・The sun will rise at 6:00 tomorrow morning.

4. It is used when making an offer or request.

・Will you marry me?

・Will you join us for lunch?

・Will you please close the door?

・Will you have another slice of cake?

・That box looks heavy. I'll help you carry it.

5. It is used to express a promise or determination about the future.

・I will never give up.

・I promise, I’ll help you.

・I will finish this project by tomorrow.

・I know it is a secret. I won't tell anyone.

Shall

"Shall" was often used in the past to express future events or actions instead of 'will'. Although it is less common than in the past, it continues to be used in some cases today.

It is used with the subjects 'I' and 'we' when making a suggestion or offer. It expresses a more emphatic meaning compared to 'will'.

・Shall we go for a walk?

・Shall I open the window?

It is used with the subjects 'I' and 'we' to indicate a feeling, intention or promise. It has a more formal meaning compared to 'will'.

・I shall call you tomorrow.

・I shall be glad to help you.

・I shall never forget your kindness.

It is used in formal language to indicate a future event, obligation or order.

・The committee shall meet once a month.

・The tenant shall pay the rent on the first of every month.