Learn Turkish: Onlar televizyon izliyorlar. - They are watching television.

In Turkish, verbs take a personal subject suffix to show who is doing the action. Since the subject is Onlar (they), we add the plural suffix -lar after the present continuous -iyor tense ending.

Can I say Onlar televizyon izliyor without the -lar on the verb?

Yes! Because the word Onlar already makes it clear that the subject is they, adding -lar to the verb is actually optional. Both versions are completely correct and very common.

The dictionary verb for to watch is izlemek. Why does it become izliyor instead of izleyor?

When a verb stem ends in a vowel like e or a (like the stem izle-), that vowel narrows to fit the -iyor suffix. Here, the e in izle- turns into an i, making it izliyor.

Why is it just televizyon without any extra endings or a word for the?

When you are talking about a general, routine activity like watching television (rather than looking at one specific TV set), you just use the plain noun in Turkish. You do not need to add any specific object endings.