I need to go now, because my lesson starts in ten minutes.
Present Simple. Correct. Present Simple can be used to talk about calendar events.
You didn't going to believe this, but I didn't have any problems.
Incorrect. Wrong Auxiliary Verb. You aren't going to believe this, but I didn't have any problems.
The TV forecast says it is reaching/is going to reach 40 degrees later today.
The TV forecast says it is going to reach 40 degrees later today.
We're having / we'll have dinner by the sea, followed by music and dancing!
We're having dinner by the sea, followed by music and dancing!
I go to buy a bigger wardrobe tomorrow.
Incorrect. I'm going to buy a bigger wardrobe tomorrow. It's a plan in the future. Be going to + inf
I hope that the weather shall be better at the end of the week.
Incorrect. I hope that the weather will be better at the end of the week. No se usa "shall" en frases declarativas.
We'd better go out soon to look round the city before it gets/will get too hot.
We'd better go out soon to look round the city before it gets too hot.
Tomorrow we'll have to/we're having to get up early.
Tomorrow we'll have to get up early.
Incorrect. I'm sorry, but I won't be in the English class tomorrow. OR I'm sorry, but I'm not going to be in the English class tomorrow.
I'm not going to be able to come tomorrow because I have a doctor's appointment.
Correct. Present simple is for calendar events.
We spoke to some friends last night and we'll meet/we're meeting them at the Parthenon.
We spoke to some friends last night and we're meeting them at the Parthenon.
We're going to Corinth/We'll go to Corinth.
We're going to Corinth.
What I'm going to do during these holidays?
Incorrect. Word Order. What am I going to do during these holidays?
There's a movie on tonight, so we'll meet everyone at Carla's house at 7 p.m.
Correct. Present Simple for calendar events.
I'm sure the view from there will be/is going to be wonderful too.
I'm sure the view from there will be wonderful too.
The train leaves/will leave at 8:15.
The train leaves at 8:15.
Correct. Will+inf for predictions in the future.
I think I'm going to buy some flowers to make my room more beautiful.
Correct. Plan = be going to + inf
Later on, I think I'm going to/ I'll go shopping.
Later on, I think I'll go shopping.
I think we'll have/we're having plenty of time.
I think we'll have plenty of time.