just getting onto plurals. i said in a conversation yesterday "iki haftalar" meaning 2 weeks. but was corrected to say iki hafta. i presumed lar would go onto end if meaning more than one like beylar. can someone help or point me in right direction for lessons on this on this website - cant see a lessons about it here

In Turkish it´s redundant to use plural suffix when a numeral adjective (or question word) is used. You don´t normally use it.

2 kişi = 2 people

3 oğlan = 3 boys

4 kız = 4 girls

5 saat = 5 hours

6 dolar = 6 dollars

7 gün = 7 days

1001 gece = 1001 nights

kaç kez? = how many times?

kaç gün? = how many days?

Sometimes we use it but it´s limited to some old stories:

7 cüceler = 7 dwarves

Ali Baba ile 40 haramiler = Ali Baba and 40 thieves

si++ - thank you for quick reply and explanation.