Learn Turkish: Biz bugün spor yapmıyoruz. - We are not doing sports today.

Let's break it down! The verb root is yap (do). To make it negative, we add a suffix that follows vowel harmony: -mı (since yap has an 'a'). Then we add the continuous suffix -yor, and finally the "we" ending -uz. So, yap-mı-yor-uz means "we are not doing".

Why is the personal ending -uz instead of -iz for "we"?

This is due to vowel harmony. Personal endings match the vowel of the syllable right before them. Because the present continuous suffix is always -yor (ending in an 'o'), the "we" ending must become -uz to match it. You will always see -yoruz for "we are..." in this tense.

English uses the plural "sports", but Turkish uses the singular spor. Why?

In Turkish, when you are talking about a general activity, you don't need a plural suffix. Spor yapmak is a set phrase meaning "to do sports" or "to exercise". Adding the plural suffix -lar isn't necessary here.

Could I put the time word bugün at the very beginning of the sentence?

Yes! Word order in Turkish is quite flexible. You could say Bugün biz spor yapmıyoruz, which puts slightly more focus on "today". The way it is written here (Biz bugün...) puts a little more focus on "We".