Verb conjugation: plain

The plain form — also called the dictionary form or the "non-past tense" — is broadly equivalent to the present and future tenses of English. Depending on the context it can either specify an action that occurs regularly, or an action that will happen. For example:

わたしはりんごをべる。
(1) I eat apples.
(2) I will eat an apple.

In most cases this form cannot be used to describe an action that's continuously happening (like "I'm eating an apple.") — for that you'd use the continuous form of a verb.

Examples
I knew you would come.
I think it's fine.
I think this is mine.
Have you seen this before?
Have you ever done it?
There are things I want to do.
Have you ever been to a singles bar?
I'm going, too.
I think I'll go.
Ah, I have been here before!
I think I'll stay here.
Have you ever been here before?
I'm here.
I'm here, too.
I think he understood me.
I knew that would happen.
"Is she coming, too?" "I hope so."
I understood what she said.
Do you want to be my girlfriend?
Are they coming, too?
I don't think that she will come.
I think she will come.
She says she will come.
I'm already inside.
Are you in there?
I've heard this before.
I've heard that before.
I shouldn't have asked.
Do you know what I'm thinking?
But I understand what he says.
I can't go until he comes.
If he's going, I'm going too.
I don't think he'll come.
I am afraid he won't come.
He will come.
We think that he will come.
I think he'll come.
I think he won't come.
I think he did it.
I think he has done it.
I expected him to come.
I thought he would come.
I thought he was coming.
I understand what he's trying to say.
I have something that I want to say to him.
What's this called?
What is this called?
That's not what I'm saying.
I can do it, but I won't.
He can do it.
I think he can't do that.
This is all I can do.
I can do it.
I knew you had a girlfriend.
How do I do this?
How do you feel about it?
What do you think of it?
How would you feel if someone did that to you?
I don't know what'll happen.
What do you think I should say?
How do you feel about what she said?
Watch how I do it.
What do you think of me?
Are you there?
He'll think about it.
Is it still there?
It's still there.
Are you still there?
He is still here.
I think it's better that way.
I told you not to do that.
Stay where you are.
Yeah. I think so, too.
I will have him come.
The more you know, the less you understand.
"Is it true?" "I think so."
Do you suppose that this is true?
The story turned out to be true.
It turned out to be true.
I think it's true.
What he says is true.
What he said proved true.
His story turned out to be true.
Do you think it's true?
Can you really do it?
You can see the Skytree from there.
What do you see?
I don't think I could've done it without you.
I didn't hear that you would come.
If you go, I'll go, too.
I understand what you mean.
He doesn't understand what you say.
If I can do it, so can you.
I will ask that.
You're the only one who can do this.
This is what I can do for you.
If you come, I'll also go!
You can do it.
Are you going, too?
What will you use it for?
"Did you say something?" "What do you think I said?"
What's the point of asking me that?
Is there something in there?
Is there something you want to ask me?
Can you see anything?
Is there something you want to say?
Do you have anything to say?
I had no idea you were coming.
Could you wait a moment?
All you can do is to wait.
I will wait here till he comes.
Let's wait till he comes.
I'm waiting for her to come here.
I'll wait here until she comes.
All I can do is wait.
I can but wait.
I can do that today.
I can do it today.
Do you know what the difference is?
I think that's wrong.
That isn't right.
Is something different?
You're going the wrong way.
You're wrong. That's not what I said.
No, it's not like that.
You can do this, can't you?
You're coming today, right?
I thought you might come.
He may be there.
He may come today.
He may come, or he may not.
What she says may be true.
She might come.
I thought he might come.
Is she coming, too?
What's in front of you?
Don't do that in this room.
He was seen to enter the room.
I saw her leaving the room.
I saw her enter the room.
I saw the man enter the room.
I saw him enter the room.
That's why I came here.
You think so, too, don't you?
He will also go.
What do you think of this house?
Are you still at home?
Are you at home now?
I saw him enter the house.
He is at home today.
I do not think that she is at home.
I'm in the house.
What do you make?
I feel something.
You will be laughed at.
I can't stop laughing when I hear that story.
You may laugh at me.
I know what that is.
We still have time.
If I have time, I'll come.
I have time, so I'll do it.
I don't know if I have the time.
If I have time, I'll do it.
I have time.
I can only wait.
I think he is a good man.
Listen to me carefully.
You should've asked me before doing that.
Do you think it a bad thing?
You'd make a good teacher.
Could you be my teacher?
Have you ever been a teacher?
He will be a good teacher.
Yumi will become a teacher.
I think that he's a good teacher.
Please wait here until he comes.
I don't quite understand what he says.
It is easy to understand what he is trying to say.
The time will come when you will understand what I mean.
I thought I was going to die.
I was afraid he might die.
I want to do it before I die.
Is there anything that I can do for you?
There's something here.
Is there something there?
Everybody thinks so.
What do you guys think?
Are you all still home?
Everyone else is dying.
I think that everybody knows.
I think with my head.
"Where are you?" "I'm here."
I don't know where it is.
Hey, where are you going?
If we have a pizza party, where should we have it?
Where are you now?
Where are you going to go today?
I don't know where I am.
I wish I knew where he was!
I don't know where he is!