I have the following two sentences:
- I have two pens, one red and one black.
- I have two pens, one is red and one is black.
I have some questions to ask:
- Are both sentences above grammatically correct?
- In sentence 1, is the omission of the to be is after the pronoun one some form of ellipsis?
- In sentence 2, if placing a comma before "one" is correct, is there another way of writing using a period (.) before the pronoun "one"? Then the second sentence would be: I have two pens. One is red and one is black.
- When we want to provide a list to clarify the object in the main clause, can we use something like "one red" as a noun phrase or "one is red" as a clause? Which usage is correct?