The key answer of exercise 3

a)

1. real
2. real
3. real
4. real
5. hypothetical
6. hypothetical

b)

1. Experience shows that if the price is higher, people think your product is better.
2. If a video goes viral, it will get millions of views.
3. People will click off unless the video is memorable.
4. Your brand name will travel around the world provided the video goes viral.
5. Supposing you wanted to sell a new brand of chocolate, ... what price would you set?
6. If another coffee shop opened next door ..., they'd sell at least a thousand cups each.

c)

• Sentence 4 → provided can be replaced with: if, providing, on condition that, as long as
• Sentence 5 → Supposing can be replaced with: If, Providing, Suppose, Imagine, Let's say

d)

1. a) present simple, present simple b) present simple, (future with) will
2. past simple, would (+ infinitive without to)
3. a) unless b) provided, providing, on condition that, as long as c) supposing, suppose, imagine, let's say