Is it correct to say "We start tomorrow"? Shouldn't it be "We are starting tomorrow"? (present simple vs continuous for future event)

Solution 1:

No, it doesn't need to be we are starting tomorrow

In a very brief and general way, there are four ways to talk about the future in English:

• Using will as in I will answer the door. This is usually used for instantaneous decisions.

• Using going to as in I am going to buy a new car. This is usually used for plans.

• Using present continuous as in I am buying a new car. This is usually used for arrangements.

• Using present simple, as in I get my new car this afternoon! This is usually used for things that are scheduled or on a timetable.

As a sequence, you decide you need a new car - I'll buy a car; then you tell everybody about your plan - I'm going to buy a car; then you go to the showroom, pick one out, and arrange to pay for it - I am buying a new car; then everything is finalised and they tell you the date and time when you can go to collect it - I get my new car next week.

This is not a random thing. It does make sense. Will because it is your will that you should have a car. Think of writing a will before you die. Going to because you have a target - a new car - that you are moving towards. Present continuous because you have begun the process of obtaining a new car. Present simple when it has become as good as a fact.