If your teacher or your leader orders you to do sth or tells you sth, I always
hear people say 'はい、わかりました。' But I also once heard somebody say 'わかる' instead
of 'わかりました' to reply. Can people do that? Can I use both of them?
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2016-10-09T01:31:06.887
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2016-10-09T03:29:39.913
2016-10-09T02:23:50.753
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question
grammar phrases
Can you use わかる instead of わかりました?
So broadly and almost overall saying, you can not or should I say, you'd
better refrain from using.

"わかりました" is, as you can see, is including 丁寧語｛ていねいご｝ ます、です、（ which is
conjugated ) so that I think almost nobody would say "わかる", especially to your
**leader**. If your teacher or leader is almost equal to your very close
friend, then "わかる" would be possible. I think somebody who is so intimate with
the teacher/leader would have said so.
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2016-10-09T01:45:51.293
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わかる (present form) is never used when you accept an order/request from anyone.
It's used when referring to something you already know. Its politer equivalent
is わかります. They are often used to show your sympathy.

>   * わかる。: I know. I understand that. You can say that. Yeah it really is.
>   * わかります。: (polite version of わかる) Yes. I know. I understand that. I agree.
>

わかった is the phrase you have to use when you accept someone's request. Its
politer equivalent is わかりました.

>   * わかった。 Okay. Got it. I see. Understood.
>   * わかりました。: (polite version of わかった) Okay. I see. Understood. Yes sir.
>

See: [What is different between 分かります and
分かりました。](https://japanese.stackexchange.com/q/21270/5010)

You should almost always use the politer versions to your boss. You may
occasionally see someone excitedly say わかる! to their boss at an izakaya
restaurant, though.
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answer