なので relationship does not seem to match in そうじが楽なので、部屋にはなるべく物を置かないようにしている


This is one of the questions taken from the book 「N3文法スペードマスター」:

> そうじが楽（ ）、部屋にはなるべく物を置かないようにしている。

The blank in the bracket is to be filled with one from this set of choices:
はず、のに、ため、ところ、べき、なので

I'm not too sure if I'm right or not, but I translated the second half of the
sentence as this: I make it a point to, as much as possible, not leave stuff
lying around in the room.

After translating that, I proceeded to translate the first half as: cleaning
is easy ( ), . From there, I thought of there being a relationship between the
two halves as such: In order for cleaning to be easy, I make it a point to, as
much as possible, not leave stuff lying around in the room.

However, I cannot find any answer from the set of choices that could possibly
fit that description, and the answer from the book was なので, which, as I would
translate it, makes the sentence something like: Because cleaning is easy, I
make it a point to, as much as possible, not leave stuff lying around in the
room. (Edit: I chose ため as my answer. I kind of forgot that that answer seemed
logical to me before I checked the book's answer and got confused.)

That didn't really seem logical to me, and after pondering for awhile, I
reasoned the answer as: I make it a point to, as much as possible, not leave
stuff lying around in the room, because cleaning _will be_ easy then.

However, that brings up another question, which is how the discrepancy
cleaning _will be_ easy instead of cleaning _is_ easy came about. Perhaps my
translation of そうじが楽 is wrong?

Thanks in advance! Hope my question is clear enough and doesn't sound lame.




Ignore the meaning of the sentence; it is secondary to grammar. Firstly,
evaluate which options can grammatically be inserted. Lets check each one.

  * -hazu can attach directly to an adjective or verb, to adjectival verb + na, and to noun + no. raku is either a noun or adjectival verb so needs to be raku na/no hazu, so you can eliminate this as an option.

  * -noni directly attaches to adjectives and verbs but requires na before nouns. Again, this cannot fit so you can eliminate it. 

  * -tame requires no when attaching to nouns, na when attaching to adjectival verbs, and can attach directly to adjectives and verbs. This does not fit, so you can cross it off the list.

  * -tokoro requiers no when attaching to nouns and can attach direclty to verbs. This will not work, so eliminate it.

  * -beki requires dearu when attaching to nouns and adjectival verbs, -ku aru for adjectives, and directly to verbs. No luck here, so remove it.

  * -nanode: Rather, you should think of this as -node, which attached directly to adjectives and verbs, but requires na when attaching to nouns and adjectival nouns. This fits, which is good because we have already eliminated all of the other options.

Here the meaning is not important. It is only a matter of grammar. When there
are multiple valid choices, then the intended meaning becomes more important.




Ignore the meaning of the sentence; it is secondary to grammar. Firstly,
evaluate which options can grammatically be inserted. Lets check each one.

  * -hazu can attach directly to an adjective or verb, to adjectival verb + na, and to noun + no. raku is either a noun or adjectival verb so needs to be raku na/no hazu, so you can eliminate this as an option.

  * -noni directly attaches to adjectives and verbs but requires na before nouns. Again, this cannot fit so you can eliminate it. 

  * -tame requires no when attaching to nouns, na when attaching to adjectival verbs, and can attach directly to adjectives and verbs. This does not fit, so you can cross it off the list.

  * -tokoro requiers no when attaching to nouns and can attach direclty to verbs. This will not work, so eliminate it.

  * -beki requires dearu when attaching to nouns and adjectival verbs, -ku aru for adjectives, and directly to verbs. No luck here, so remove it.

  * -nanode: Rather, you should think of this as -node, which attached directly to adjectives and verbs, but requires na when attaching to nouns and adjectival nouns. This fits, which is good because we have already eliminated all of the other options.

Here the meaning is not important. It is only a matter of grammar. When there
are multiple valid choices, then the intended meaning becomes more important.

