20 Fill in the correct tense, then say what type of
conditional each sentence is.

1 She will miss the train unless she
(come) now.

2 If you mix red and blue paint, you (get) purple

3 I (come) to the concert if
there are any tickets left.

4 If you wear that coat, you (be) too hot

5 He'll go to university unless he
(fail) his exams

6 If you (pour) oil on water, it floats.​

1. She will miss the train unless she comes now. (simple present)
- This sentence is a first conditional sentence, which describes a possible future condition and its possible result.

2. If you mix red and blue paint, you get purple. (simple present)
- This sentence is a zero conditional sentence, which describes a general truth or fact.

3. I will come to the concert if there are any tickets left. (simple present)
- This sentence is a first conditional sentence, which describes a possible future condition and its possible result.

4. If you wear that coat, you will be too hot. (simple future)
- This sentence is a first conditional sentence, which describes a possible future condition and its possible result.

5. He'll go to university unless he fails his exams. (simple present)
- This sentence is a first conditional sentence, which describes a possible future condition and its possible result.

6. If you pour oil on water, it floats. (simple present)
- This sentence is a zero conditional sentence, which describes a general truth or fact.

In each sentence, the verbs are placed in the correct tense to represent the condition and the result of each sentence. The type of conditional sentence is also mentioned for each sentence, indicating whether it is a zero conditional or a first conditional.