Simple future tense will/going to

Simple Future has two different forms in English: "will" and "be going to." Although the two forms can sometimes be used interchangeably, they often express two very different meanings. These different meanings might seem too abstract at first, but with time and practice, the differences will become clear. Both "will" and "be going to" refer to a specific time in the future.

1. Future tense “will”

• To assert incident/event that future and decide that incident at talking.
• Example 
• A: Can you help me to do this homework?
• B: Of course, I will do it for you.

• To offer to do something. 
• Example
• A: I don’t have a pen to write. 
• B: Don’t worry. I will lend you.

• To assert an agreement to do something. 
• Example
• A: You must come to my party. 
• B: I promise I will come on party.

• To predict event that will be happened. 
• Example
• A: Will I pass the test next month? 
• B: Don’t worry, you will pass.

• To assert an incident/event that will be sure happened. 
• Example 
• A: I’m seventeen years old now. How old will I be next year? 
• B: You will be eighteen years old next years.

2. Future tense “shall”

• To assert a deal or gift suggestion 
• Example: Today, we are free. Where shall we go?
• Note: shall for subject “I, we”

3. Future tense “be going to”

• To assert an incident that will be happened and gone ever break a promise to do it. 
• Example
• A: Did you send my letter for her? 
• B: Oh, I’m sorry I forgot. I’m going to send it tonight.

• To assert an incident/event that cause there are incident/event that mention that what will be next happened. 
• Example
• A: The sky is very dark. What do you think?
• B: I think it’s going to rain.

4. Time Signal

• Tomorrow...
• Morning
• Afternoon
• Evening
• Night

• Next...
• Time
• Week
• Month
• Year
• January

• Tonight 
• The day after tomorrow
• Soon
• Later
• Two, three more days
• Two, three days later
• By and by

5. Pattern

• Positive (+)
• Subject + shall/will + VI 
• Example:
• I shall clean the room.
• We will go to school. 
• She will give a present.
• Note: “shall” just can use for subject “I and We”

• Subject + to be + going to + VI 
• Example:
• I am going to play tennis.
• They are going to swim very fast.
• He is going to write a story.

• Negative (-)
• Subject + shall/will + not + VI 
• Example:
• I shan’t buy a shirt. 
• He won’t clean the room.

• Subject + to be + not + going to + VI 
• Example:
• I am not to give a present.

• Interrogative (?) 
• Shall/will + subject + VI ?
• Example:
• Will we play tennis?

• To be + subject + going to + VI ? 
• Example:
• Is she going to write a story?