Going to

Going to-future
The going to-future is one future tense. There are other future tenses, like the will-future, thePresent Progressive, the Future Progressive/Continuous and the Simple Present.
Weuse the going to-future:
1) planned actions in the future
We are going to sing at the party.
They are going to fly to South Africa.
2) You are certain that sth. is going to happen in the future.Look at this car! It is going to crash into the yellow one.

Form of the going to-future
We use a form of to be (am, are or is), going to and the infinitive of the verb.
to be (am, are, is) + goingto + infinitive

Affirmative sentences
Example:
I am going to play handball.
He/she/it is going to play handball.
We/you/they are going to play handball.NOTE: Use am with I, is with he, she, it and with all other pronouns are.
We often use short forms in affirmative sentences in the going to-future:
Negative sentences
Example:
I am not going to play handball. 
He/she/it is not goingto play handball.
We/you/they are not going to play handball.
NOTE: We often use short forms in negative sentences in the going to-future.
Questions
In the going to-future we put the auxiliary (am, are or is)before the subject 
(Auxiliary - Subject - going to - Verb - Rest).
Example:
Am I going to play handball? 
Is he/she/it going to play handball? 
Are we/you/they going to play handball?

Shortforms in the going to-future
We often use short/contracted forms with the going to-future.
affirmative |
long form | short form |
I am going to buy | I'm going to buy |
he, she, it: | he,she, it: |
he is going to buy | he's going to buy |
we, you, they: | we, you, they: |
we are going to buy | we're going to buy |

negative (not after to be) |
long form | short form |I am not going to buy | I'm not going to buy |
he, she, it: | he, she, it: |
he is not going to buy | he isn't going to buy
oder 
he's not going to buy |
we, you, they: | we, you, they:...