た形の作り方

## What it means The **た-form** is how you say something happened, using the casual, plain style. It's built the exact same way as the **て-form** you already know — the only difference is the last sound is **た** instead of **て**.

## When to use it Use the same sound-change rules you learned for て-form. For **Group 1 verbs** (う-verbs): words ending in う・つ・る become **った** (買う→買った), words ending in む・ぬ・ぶ become **んだ** (飲む→飲んだ), words ending in く become **いた** (書く→書いた), and ぐ becomes **いだ** (泳ぐ→泳いだ), while words ending in す become **した** (話す→話した). The verb 行く is a special exception — it becomes **行った**, not 行いた. For **Group 2 verbs** (る-verbs like 食べる, 見る), just drop る and add た. For the two **irregular verbs**, する becomes した and 来る becomes 来た.

## Don't confuse it with It's easy to mix up た-form with **て-form**, since they're built the same way. Remember: て-form connects actions or makes requests (食べて!), while た-form simply marks something as finished in the past (食べた = 'I ate'). Also don't confuse casual た-form with polite past — 食べた and 食べました mean the same thing, just at different politeness levels.