both correct in past or present.
no, its not a correct sentence. its have you taken the test before.
The correct sentence is the following: "What were you doing from before?"
The correct sentence is: "Have you ever traveled before?"
Where DID you live before is the correct grammar.
The correct spelling of the word is before (prior to, earlier).
Yes, "before" is the correct spelling.
Grammatically correct.
Yes that is correct.
The first thing you do before correcting a sentence would be read it. Then you would need to correct what needs to be.
No, the correct form is "Is she correct?" The subject (she) comes before the verb (is) in English sentence structure.
Arrived at two minutes before their cut off time is not a correct grammar.Is arrived at two minutes before their cut off time is not a correct grammar.
Everythging works better when the balance is correct, but you do not need to correct the pH before adding chlorine. Just keep an eye on it.