1. We see through/with our eyes.

2. We eat through/with our mouth.
3. We run through/with our legs.
4. We talk through/with our mouth.
5. We breathe through/with our nose.

(Would you check the sentences? Which preposition do I have to use? Are both OK?)

6. Don't break off the branches.
6-2. Don't break away the branches.
(Can we use 'away' as in 6-2?)

7. Please make up your own character.(in a comic book)

7-2. Please _________ your own character.

(What other expressions can we use instead of 'make up'?)

1 - 5 -- The preposition "with" is better with all of these.

6 is better than 6-2.

7 is fine. Other verbs/experessions you can use are create, devise, invent ...

Well, in sentence 5, you could use either preposition!!

1. We see with our eyes. (Correct)

2. We eat with our mouth. (Correct)
3. We run with our legs. (Correct)
4. We talk with our mouth. (Correct)
5. We breathe through our nose. (Correct)

6. Don't break off the branches. (Correct)
6-2. Don't break away the branches. (Incorrect)

In sentence 6, "break off" is the appropriate phrasal verb to use. It means to snap or detach something from its main body. "Break away" generally implies breaking free from something, like breaking away from a group or breaking away from a situation. Therefore, the correct sentence is "Don't break off the branches."

7. Please make up your own character. (Correct)
7-2. Please create your own character.

Instead of "make up," you can also use the word "create" to indicate the act of inventing or designing something. Therefore, you can say "Please create your own character."

1. We see with our eyes. - Correct preposition.

2. We eat with our mouth. - Correct preposition.

3. We run with our legs. - Correct preposition.

4. We talk with our mouth. - Correct preposition.

5. We breathe through our nose. - Correct preposition.

In all of these sentences, the prepositions used are correct. The prepositions "through" and "with" can be used interchangeably in some cases, depending on the context.

6. Don't break off the branches. - Correct sentence.
6-2. Don't break away the branches. - This sentence is not commonly used. Instead, you can say "Don't break the branches off" or "Don't remove the branches".

7. Please make up your own character. - Correct sentence.
7-2. Please create your own character. - This is an alternative expression you can use instead of "make up".

Other expressions you can use instead of "make up" include:
- Design your own character.
- Invent your own character.
- Imagine your own character.