To say I can in Turkish  you use the suffix ebilir. 

Example

gelebilirim - I can come

Just remember

verb + ebilir/abilir + personal suffix

Personal suffixes

So for example if we wanted to say

we can stay

we would write as

kal + abilir + iz

kalabiliriz

I can promise

söz ver + ebilir + im

söz verebilirim

He can watch

izle + ebilir 

izleyebilir

now look closely at the last sentence, ´he can watch´, do you notice anything?

izle + y + ebilir

There´s that buffer y, can you remember why the buffer y was put there? talked about it briefly in a previous lesson. The buffer letter y is put in place there to keep the 2 vowels ´e´ and ´e´ from being put together.

Using the method above try making up your own sentences