Dear sir,

Which option is correct ?

1) a- a week's haliday

b- one week's holiday

2) a- two weeks' holiday

b- a two weeks' holiday

Concerning number ( 1),

I think (a) " a week's haliday" is the correct answer . If we use a definet article in this structure, we can't use a number.

As for number (2),

I think number (a) is the correct answer. If we use a number in this structure,we can't use an article.

Original Post

Hi, Basant Al-Sayed,

Dear sir,

Which option is correct ?

1) a- a week's haliday

b- one week's holiday

Concerning number ( 1),

I think (a) " a week's haliday" is the correct answer .

Yes, 'a' is the correct one. For 'b' to work, you can say "a one-week holiday''.

Dear sir,

If we use a definet article in this structure, we can't use a number.

In 'a', 'a' is not a definite article. It is an indefinite article.

2) a- two weeks' holiday

b- a two weeks' holiday

As for number (2),

I think number (a) is the correct answer.

Yes, 'a' is the correct one. If you want to know the reason why 'a' works in both, but not 'b', see this recent thread:

https://thegrammarexchange.inf...-a-ten-minutes-break