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ことにする - koto ni suru means "decide to do
...."
It follows the short form present tense of a verb. You can
use a negated verb, too. |
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車を買うことにしました。 |
We have decided to buy a car. |
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kuruma-o kau koto-ni shimashita. |
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あの人がかわいそうだから、
あまり文句を言わないことにします。 |
I will not make too many complaints. I am feeling sorry for
him already.
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ano hito-ga kawaisoo dakara,
amari monku-o iwanai koto ni shimasu. |
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We sometimes use the volitional form of this
construction, such as iku koto ni shiyoo,
instead of the simple volitional form of a verb,
行こう - ikoo, in suggesting an
activity.
koto ni shiyoo has the additional implication that
the suggestion is being made after a deliberation. |
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今年の夏はベトナムに行くことにしよう。 |
Let's take the plunge. Let's go to Vietnam this summer. |
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kotoshi-no natsu-wa betonamu-ni iku koto ni
shiyoo. |
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こと に して いる - koto ni shite iru means "do something as a regular practice,"
that is, you
have made up your mind that you should do something and have stuck to that determination. |
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毎日十一時に寝ることにしています。 |
I make it a rule to go to bed at eleven every night. |
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mainichi juu-ichi-ji ni neru koto ni shite
imasu. |
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絶対にお酒を飲まないことにしています。 |
I have made this firm decision not to drink and have
strictly followed it. |
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zettai-ni o-sake-o nomanai koto ni shite imasu. |
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～ことにする |
decide to do ... |
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~ koto ni suru |
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～ことにしている |
do ... as a regular practice |
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~ koto ni shite iru |
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