Какой is one of the question words in Russian. It asks a question, so we call it ‘interrogative,’ and in terms of its endings it's an adjective, so we call it an ‘interrogative adjective.’ It declines like this:

Although какой can be translated several ways, it's most common meaning is “what kind of”:

Sometimes какой has about the same meaning as который, and in those instances we can often translate it as ‘what’ or sometimes ‘which’:

English is interesting in terms of comparatives. Sometimes you can use a comparative with -er, but you can't use a comparative with “more.” Thus “cuter” is okay, but “more cute” is not. We call the -er form the simple comparative. Sometimes the “more” form is okay, but the “-er” form is not. Thus “My life is more interesting than yours” is okay, but “My life is interestinger than yours” is not. When you use “more” with an adjective, we call that the compound comparative. Russian also has both simple and compound comparatives. The word used for compound comparatives is более. The более form is almost always acceptable in Russian:

Note: Задача really means assignment or taks, but in certain contexts like арифметическаая задача it can mean the equivalent of equation. The normal word for equation is уравнение.

Another word that means bigger is больше. In this meaning it is what we call a comparative adjective:

Just as with other comparative sentences, if чем is followed by a simple noun phrase in the nominative case, you can make an equivalent phrase without чем by putting the noun in the genitive. Thus the second and third sentences from above can be rephrased as:

One thing you can't do with больше is to make a sentence like “John lives in a bigger house than Victor.” When “bigger” directly modifies a noun, Russians have to use either «больший» or «более большой», thus:

Больше has other meanings as well. We will explore them over the next couple weekds.

Now here's a subtle detail of the Russian language. It's one that will trip you up at first when you start reading Russian if you aren't paying attention. Although большой means big, there is another word больший that means bigger, greater, or larger. Since Russians don't usually write stress marks, the presence of о or е after the ш is often the only written indication of which meaning is implied. Больший declines like this:

Sample sentences:

As part of your Russian reading strategy in your early years, you might want to pause when you come across большой and больший. If you spot a е after the ш, then remind yourself that it means “bigger.” That helps in the singular of most forms. Alas, only context can tell you which one the author had in mind in the plural.

The most common word for big or large in Russian is большой. Notice that it is an end-stressed adjective: end-stressed adjectives always end in -ой in the masculine nominative singular. It declines like this:

Sample sentences:

One phrase that the Russians use often is большие деньги, which word for word means “big money,” although it is often better translated as “a lot of money”:

One of the fun words that has developed in English over the last decade or two is “gynormous,” a combination of gigantic and enormous… in other words, really, really big. Russian has a similar word большущий, a combination of большой “big” and могущий “powerful,” which also means really, really big:

One last thing: it is easy to confuse the word большой with the word больший. They mean different things. We'll address the latter word tomorrow.