Future Simple

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Among all future tenses, the Future Simple is the most common. It is used in many situations such as when making promises or predictions.

Here goes a list to make it more readable.

Use

Promises (Use 1)
Unplanned actions (spontaneous decisions) (Use 2)
Predictions based on experience or intuition * (Use 3)
Habits

* Use going to form to express predictions based on observing the present situation.

** You may sometimes encounter the form gonna, which is a contraction of going to.
Gonna is informal so be careful when using it!

Form

Positive sentences:

Subject	+	Auxiliary verb	+	Verb
I/a dog etc.	+	will	+	go/take etc.

CAUTION

Remember, you should never use will to say what somebody has already arrange or decided to do in the future:

Mike is moving to New Jersey next month (not "Mike will move")

I think he will regret his choice. (Use 3)

I will come back at 10 p.m. (Use 1)

swffile

When I'm 60 years old, I will be completely bald. (Use 3)

I will go to Mary (Use 1)
(the speaker decided to go to Mary in the moment of speaking.)

Let's buy the snacks at the supermarket - they will be cheaper (Use 3)

Questions (interrogative sentences):

Auxiliary verb	+	Subject	+	Verb
will	+	I/a dog etc.	+	go/take etc.

Remember

We often use will with:

probably, most likely	I'll probably drop in on uncle.
I think	This gift is great. I think we'll love it.
I'm sure	It's not going to be boring there. I'm sure there will be a lot of boys at your age
I wonder (if, what, when, etc.)	It's a bit late. I wonder if he'll come.
I expect	I haven't seen Matthew today. I expect he'll call today.

Will he be angry when he sees me? (Use 3)

What do you think - will Mark arrive at 10 or 9? (Use 3)

Negative sentences:

Subject	+	Auxiliary verb + not	+	Verb
I/a dog etc.	+	will not/won't	+	go/take etc.

I won't take any equipment with me. (Use 2)

I'm sorry I won't be able to help you with your English today. (Use 2)
(The speaker didn't know he or she wouldn't be able to help his or her friend with English - that's why it's Use 2)