Use: To talk about personal plans or arrangements in the future, especially when they are definite or already decided.

Structure: Subject + am/is/are + verb+ing.

Examples:

• I am meeting my friend tomorrow. (Personal arrangement)

• We are flying to Paris next week. (Definite plan)

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Key rule: We use the present continuous for future events when we’re discussing something we have decided or arranged, typically personal plans.

Use: To talk about scheduled events or things that are part of a fixed timetable, like transportation, appointments, or events that are beyond personal control.

Structure: Subject + base verb (he/she/it uses "s").

Examples:

• The train leaves at 9:00 tomorrow morning. (Scheduled event)

• Her class starts at 8:00 next Monday. (Timetable)

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Key rule: We use the present simple for the future when something is set or planned, especially events that follow a schedule or timetable.

Use: For decisions made at the moment of speaking, promises, offers, and predictions based on what the speaker thinks, believes, or expects (often without concrete evidence).

Structure: Subject + will + base verb.

Examples:

• I'll help you with that! (Decision made at the moment)

• It will probably rain tomorrow. (Prediction based on personal belief)

• I will call you later. (Promise)

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Key rule: Use "will" when you are making a spontaneous decision, offering help, making promises, or giving predictions based on opinions.

Use: For planned actions or intentions already decided before the moment of speaking, and for predictions based on present evidence.

Structure: Subject + am/is/are + going to + base verb.

Examples:

• I'm going to visit my grandparents next weekend. (Plan/arrangement made earlier)

• Look at those clouds! It's going to rain soon. (Prediction based on evidence)

• She’s going to study medicine next year. (Future intention already decided)

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Key rule: Use "going to" when you are talking about plans or intentions made before the moment of speaking or when you are making predictions based on something you see or know now.