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Grammar detail: をする vs する

をする vs する
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It is not uncommon to see を between the noun and する in a sentence using a する verb. For example:
わたし
まいにち
毎日
じかん
時間
うんどう
運動
をする

I get two hour's exercise every day.
The extra を adds an emphasis to the noun the する verb comes from, rather than the action the する expresses in the sentence. In English this might be expressed by turning the verb into a noun and using an extra verb such as 'do':
べんきょう
勉強
する to study
べんきょう
勉強
をする to do (some) studying
したく
支度
する to prepare
したく
支度
をする to make preparations
そうじ
掃除
する to clean
そうじ
掃除
をする to do (the) cleaning
でんわ
電話
する to phone
でんわ
電話
をする to make a phone call
Note that the additional を can only be used in this way with a regular する noun. It cannot be used with adverbs such as さっぱりする or modified verbs such as
どう
ずる. It also cannot be used if the する verb already takes an object with を (although it may be possible to replace the first を with の), as in for example 部屋を掃除する ➜ 部屋の掃除をする.
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Kanji used in this grammar

ベン    exertion   
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キョウ   ゴウ   つよ strong   つよまる to get stronger   つよめる to strengthen   しいる to compel, to force   
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シ   ささえる to support   
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ド   ト   タク   degree   たび occasion, time   
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ソウ   は to sweep   
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ジ   ジョ   のぞ to exclude; to remove   
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デン    electricity   
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ワ   はな to talk   はなし talking   
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ドウ   うご to move, to stir   うごかす to shift, to move   
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ブ   part
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オク   や roof   
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シ   わたくし    わたし I, myself   
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マイ   every, each
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ニチ   ジツ   sun; day   ひ    -か    
ジ   とき time, occasion   
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カン   ケン   あいだ interval, between   ま space, room   
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ウン   carry; luck   はこ to carry   
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