yeah that's a proper sentence
You did a proper job of it.
use it in a sentence
No that would not be proper English. Best by itself in a sentence is correct.
No, "Is what" is not a complete sentence in proper English. It is grammatically incorrect and lacks subject-verb agreement. It needs additional context or words to form a complete and coherent sentence.
Yes.
Yes, the sentence 'Where are you?' is a correct sentence. The three words are a complete thought with a subject, the pronoun 'where', and a verb, 'is'.
No, the sentence is not proper English. It should be "We are talking to ourselves."
In proper English usage you do not end a sentence in a preposition, so at should not end the sentence Where is Jasmine is sufficient.
The sentence "He's surprised me" is fine. If the contraction is expanded, the sentence becomes "He has surprised me".
According to proper English grammar, no. "With" is a preposition. You aren't supposed to end a sentence with a preposition.
Yes, it is proper English to start a sentence with the word "oh." This interjection can be used at the beginning of a sentence to express a range of emotions or to call attention to something specific.
This is not proper English. Saying you did, you are going to, or you are in the process of, is an educated way to articulate your sentence.