What is は?
The particle は (pronounced "wa," not "ha") is one of the first things you learn in Japanese, and also one of the trickiest to fully understand. Its job is simple on the surface: it marks the topic of your sentence. Think of it as saying "as for this thing, here's what I want to tell you about it."
When you say 天気は いいですね, you're setting up "the weather" as your topic and then commenting on it. It's like pointing at something and saying "so, about that..."
は shows up everywhere in daily conversation. You use it to introduce what you're talking about, to contrast two things, and to set the scene for whatever comes next. For a hands-on introduction, our lesson on basic sentence structure covers は alongside です and ます from the ground up. You can also read our complete guide to Japanese particles for a broader look at how は, が, を, に, and で all work together. It doesn't tell you what something is doing (that's が's job). It tells the listener what you're talking about.
One important thing: you don't need to slap 私は at the start of every sentence. In Japanese, if it's obvious you're talking about yourself, dropping the topic entirely sounds much more natural. Saying 私は every time actually sounds a bit stiff and overly formal, like a textbook robot. Context does the heavy lifting in Japanese, so trust it.
は also pulls double duty as a contrast marker. When you say コーヒーは飲むけど、紅茶は飲まない, the は on both items signals you're drawing a comparison between them.
は vs が — The Key Difference
This is the million-yen question, and we have a full は vs が breakdown if you want the deep dive. Here's the short version:
- は marks what you're talking about (the topic, old/known information)
- が marks who or what is doing something (the subject, new information)
Think of it this way: if someone asks "Who broke the window?", the answer uses が because you're identifying the subject. 弟が割った (my little brother broke it). The brother is the new, important information.
But if someone asks "What about your brother?", you'd use は. 弟はもう寝た (as for my brother, he already went to sleep). Your brother is already established as the topic.
A quick rule of thumb: は answers "what about X?" while が answers "who/what did it?"
How to Use は
Basic pattern:
[Thing you want to talk about] + は + [comment about that thing]
Key formation rules:
- は replaces the particles を and が when marking a topic (but not に, で, etc.)
- With other particles, は stacks after them: には, では, からは
- You can have multiple は in one sentence when contrasting