Learn Turkish: Harika gösteriyi önden izleyelim mi? - Shall we watch the wonderful show from the front?

The verb root is izle (to watch). Since it ends in a vowel, we use the buffer letter -y- before adding the "let's" ending -elim to make izleyelim (let's watch). Adding the separate question particle mi turns it into "shall we watch?".

Why is it gösteriyi and not just gösteri?

Gösteri means "show". Because it is the specific thing being watched (the direct object), it takes the accusative case ending. Since gösteri ends in a vowel, we add the buffer -y- followed by the matching vowel -i, giving us gösteriyi.

What does the -den do in önden?

The noun ön means "front". The -den suffix means "from" (the ablative case). Together, önden translates to "from the front".

Why don't we add any endings to harika?

Harika (wonderful) is an adjective. In Turkish, adjectives don't take any plural or case endings when they describe a noun. Only the noun itself, which is gösteriyi in this sentence, gets the grammar endings.