1) BE GOING TO
- aikomus tai ilmeinen lähiajan tapahtuma

I am going to leave tomorrow. (You are... / She is...)
It is going to rain at any moment.

2) Kestopreesens (BE + ing -muoto)
- lähitulevaisuudessa tapahtuva, sovittu asia

We are watching a movie later tonight.

3) Yleispreesens
- aikataulun mukaan tapahtuvat asiat

The train leaves at 8.30. / The museum opens at 10 o'clock.

4) BE ABOUT TO
- jokin asia on tapahtumaisillaan tai vähällä tapahtua hyvin pian

I am just about to leave. I should be there in fifteen minutes.