Verbs represent actions and are required in every sentence.
Verbs always appear at the end of clauses; a valid sentences requires only a verb. This works due to the language relying on context to infer additional information.
This is a valid sentence (it does not require anything else such as a noun), however the only information it contains is that someone will buy somethings, it makes no sense on its own without additional information inferred from the context (such as who will buy what).
All verbs except 2 (see below) can be categorized as either:
Based on the above, it is straightforward to classify verbs:
If a word falls into the last case, the easiest way to determine the type is to check the dictionary page, which provides an ichidan verb tag for る-verbs or a godan verb tag for う-verbs.
There are 2 exceptions to the above:
Be sure to remember them as they are common exceptions in conjugation rules as we will see in future chapters.
Here are some common verbs, grouped by type:
And some example sentences using them:
外に犬がいる！ - There's a dog outside!
私はケーキを買う - I will buy cake.
何をする？ - What will you do?
明日もここに来る？ - Will you come here again tomorrow?