1. Infinitives

Verbs in Turkish, when used alone, have the imperative meaning as in English.

do --> yap

come --> gel

go --> git

drink --> iç

sleep --> uyu

In order to make a verb infinitive, the suffix -mek is used. 

to do --> yapmak (changes to -mak since yap[do] is a hard word)

to come --> gelmek

to go --> gitmek

to drink --> içmek

to sleep --> uyumak

The following are examples to the use of infinitives in Turkish:

It is good to sleep. --> Uyumak iyi(dir).

It is difficult to study. --> Çalışmak zor(dur).

I want to go. --> Gitmek istiyorum.

I want to walk. --> Yürümek istiyorum.

2. Plurals

To make plurals of nouns, the suffix -ler is used. Below are some examples, note how the suffix -ler becomes 'sometimes -ler, sometimes -lar' obeying the rules of vowel harmony.

road(s) --> yol --> yollar

tree(s) --> ağaç --> ağaçlar

rose(s) --> gül --> güller

room(s) --> oda --> odalar

house(s) --> ev --> evler

job(s) --> meslek --> meslekler