1. You're only three. You old to go to school.2. The traffic is terrible. There arecars on the road.3. I'm tired to go out.4. Have we gotbread to make a sandwich?5. Theremilk for our coffee. We need to buy some more.6. There isrubbish in our streets, ​

1. You're only three. You old to go to school.
Answer: The correct sentence should be "You're only three. You are too young to go to school."
Explanation: "Old" means "having lived for a long time" or "no longer young". In this context, we are referring to a child's age, so "too young" is the appropriate phrase to use.

2. The traffic is terrible. There are cars on the road.
Answer: The sentence is correct.
Explanation: The sentence is grammatically correct and conveys the message that there are many cars on the road, causing the traffic to be terrible.

3. I'm tired to go out.
Answer: The correct sentence should be "I'm too tired to go out."
Explanation: When expressing the reason for not doing something, we use the phrase "too (adjective) to (verb)" instead of just "adjective to (verb)". So in this case, it should be "too tired to go out".

4. Have we got bread to make a sandwich?
Answer: The sentence is correct.
Explanation: The sentence is grammatically correct and asks if we have bread available to make a sandwich.

5. There milk for our coffee. We need to buy some more.
Answer: The correct sentence should be "There is no milk for our coffee. We need to buy some more."
Explanation: The word "no" is missing before the word "milk" to indicate that there is a lack of milk. So the corrected sentence states that there is no milk for our coffee and we need to buy some more.

6. There is rubbish in our streets.
Answer: The sentence is correct.
Explanation: The sentence is grammatically correct and describes that there is rubbish present in our streets.