They are both correct.
Note: Cambridge uses British English.
Both "forward and backward" and "forwards and backwards" are grammatically correct. "Forward and backward" is more commonly used in American English, while "forwards and backwards" is more commonly used in British English.
'What a drunkard you are' is a grammatically correct English sentence.
"For free' is grammatically correct. It is an idiom of the English language.
This is not acceptable in English English but it may be in American. (Americans say: meet with you. In England we say: meet you.)
The correct spelling is "organization" with an "s" in British English and "organization" with a "z" in American English.
Australia officially uses British-English.The correct spelling in British-English (and therefore in Australia) is centre.In American-English, the correct spelling is center. American-English is considered incorrect in British-English countries.
The correct spelling in British-English is favourite.The correct spelling in American-English is favorite.
The grammatically correct statement is "She does not have her book." In English, the verb "have" is used as an auxiliary verb in negative sentences, so the correct form is "have" instead of "has."
The grammatically correct version in American English is "Even when you're right, you're wrong."
Hi!
Depends on who is speaking. In British English staffgenerally takes a plural verb, but in America it takes a singular one.
You need to learn the rules of English grammar to be able to correct sentences.