"Have you a car?" is a technically correct sentence, but, at least in the United States, it is not idiomatic and will sound strange to most listeners. The idiomatic version is, "Do you have a car?". Simple present and past tenses are almost never used in the USA. for questions. Instead, the intensive tense, formed by the appropriate tense of "do" plus the infinitive of the principal verb (without the word "to") is used; the question begins with the appropriate form of "do"; that is immediately followed by the subject, which in turn is followed by the infinitive of the principal verb.
For perfect tenses and for the passive voice, no additional word is added to the verb form, which already has at least two words, but the same "inverted" effect is obtained by placing the auxiliary verb before the subject, followed by the remainder of the verb.
Yes, the sentence "Yesterday Tom washed the car" is grammatically correct.
Yes, perfectly correct.
Remove 'it' word ... My car is beautiful
Yes!
To correct the unclear reference, you must reword the sentence. The sentence isn't clear that the pronoun 'it' refers to the suit or the car. Reworded: Take the suit to be cleaned when you take out the car. Put the suit in the car and take the car to be cleaned.
customers are going to purchase a car
Yes "She had a car" is correct in the sense that She used to have a car before but it is not there right now. It would be incorrect to the sense that She had a meal which means she ate the meal..
Past-tense. Solid wording.
Yes, very correct.
Yes, that wording is correct. An example of a sentence that uses this wording is "I am not looking forward to washing the car."
they're both correct depending on if your talking in past tense or present
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.