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Could someone please check my understanding of how から is used with nouns etc?

Today I read what I think were some rules. から needs だ/です depending on what precedes it.

しずか ですから 散歩しましょう

-na adj, needs です.

天気がいいから 散歩しましょう

-i adj, doesn't need です

コーヒーを飲むことですから、しずかにしてくれ

noun, needs です.

猫がいますから、しずかに してくれ

verb, doesn't need です

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I think you have the right idea- nouns and na-adjectives require a copula (だ・です) before it. That way, it doesn't get mixed up between the "from" meaning of から.

しずか ですから 散歩しましょう

Correct; a copula is required if a na-adjective comes before から.

But I do want to point out that you can still use だから (as opposed to ですから) even if the sentence is polite. The most important thing is that the main (i.e. final) verb is in the polite form.

天気がいいから 散歩しましょう

Correct; with い adjectives using だから is ungrammatical. (You actually can use ですから with an い adjective, but it isn't necessary.)

コーヒーを飲むことですから、しずかにしてくれ

You are correct that you'll need だから or ですから after the noun こと. But I don't see any reason to have こと there at all. It should just be 飲むから (or, in this case, 飲んでいるから).

Also, the inconsistency in politeness here is a little strange. You used impolite -てくれ at the end, but polite ですから in the middle. It is weird to have an impolite independent clause with a polite dependent clause. But that's not what this question is about.

猫がいますから、しずかに してくれ

Correct; だ or です do not (and cannot) immediately precede から if there is a verb and not a noun or na-adjective there. (However, this sentence also has the same problem as last time with the inconsistent politeness)

  • What is the meaning of しずかにしてくれ? " is it the same with しずかにしてください (please be quiet)? But it doesn't seems to fit (not make sense) in the sentence samples of cat and coffee. – Alice28 Jun 10 '16 at 19:13
  • maybe it's a big cat and if you're not quiet and wake it then .... well let's just say you've got bigger problems. – A.Ellett Jun 10 '16 at 20:16
  • なぜあの人が好きですか。あの人はきれい(だ/です)からです。I feel a bit strange to hear きれいだからです。 or きれいですからです。What do you think? – Money Oriented Programmer Jun 11 '16 at 5:20
  • @優しいエイリアン those do sound weird; I think you'd just use だから or ですから instead. – Blavius Jun 11 '16 at 5:48

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