Yes, but I don't usually take a very long vacation.
Yes that is a correct sentence, as long as you have identified who "he" is in a previous statement.
The phrase (not sentence) 'long-standing army' is grammatically correct. It means 'an army that has been established for a long time.'
H
As a question, It would be Does your mother have long hair? As a statement, it would be Your mother has long hair.
Yes, "How long have you been living in Oxford?" is a good sentence.
The e-mail is too long.
As long as you need it to be! There is no magic formula for telling how long your sentences should be.Write a correct English sentence with a subject and a predicate, give it correct grammar, spelling, and punctuation, and that is how long it is supposed to be!
No, the sentence is not grammatically correct. It should be: "It had been a long time since I had written to you."
The sentence is correct if you and the article 'a': "She started her journey a long time ago."
not correct we have to use as instead of so before the word long
That will be correct so long as you finish the sentence and say when or where it was built. Otherwise, it is just part of a sentence.
Yes, the sentence is grammatically correct. It describes how the streetlight is casting long, scary shadows on the sidewalk.