If you are writing proper grammar you should not use 'then' at the beginning of a sentence.
The proper grammar for that sentence is "She was much better than yesterday." This sentence is in the past tense and correctly compares her current state to how she was yesterday.
The sentence "I wish you were as smart as they." is grammatically correct. It is shortened from "... as smart as they are."
The proper grammar is "There has come a time." "There" is the subject of the sentence and is singular, hence the correct verb form to use is "has" instead of "have."
The proper grammar is "a urinary" because the word "urinary" begins with a consonant sound, even though the first letter is a vowel.
Yes. You and I know that's true. However, sometimes it can be hard for you and me.
Why she asked me, I'll never know. "Why" is not the primary question here.
no, that is definitely not proper grammar.
No
No
The proper grammar for that sentence is "She was much better than yesterday." This sentence is in the past tense and correctly compares her current state to how she was yesterday.
The sentence "I wish you were as smart as they." is grammatically correct. It is shortened from "... as smart as they are."
Yes, "The house is not as cheap as he thought" is proper grammar.
Yes. That sentence is proper as written.
The proper grammar is "There has come a time." "There" is the subject of the sentence and is singular, hence the correct verb form to use is "has" instead of "have."
Yes. For example, What did she point at ? However, do not use 'at' with 'where.'
The proper grammar is "a urinary" because the word "urinary" begins with a consonant sound, even though the first letter is a vowel.
According to proper English grammar, no. "With" is a preposition. You aren't supposed to end a sentence with a preposition.