Like Timo said, both are correct. The difference is quite minor. "Changes are needed" makes it seem like you need to make changes to something at the given moment before anything else proceeds e.g. "changes to the plan are needed for the new building" -> implies that we need to make change before we do anything else for the new building "Changes are necessary" implies that some kind of change is very important or significantly useful but not necessarily urgent/first priority e.g. "changes to the plan are necessary for the new building" -> implies that some change should occur to the plan before the building is finished/finalised

They have the same meaning but slightly different tones. "I'll keep my calendar clear." -> (好的) I'll make sure I'll be available (through someone else's request to do something) "I'll make enough time out of my calendar." -> (好吧) I'm quite busy, but I'll try to be available (from own wishes to do something) "I'll make enough time out of my calendar." -> It's okay, even though I'm busy, I want to do this enough to make some time That's the general vibe I get from the sentences, it would depend on the person though

Even though we can see these people (successfully) adapting to change and how much suffering it is causing them, "Conditioning" refers to making someone adapt to something "I conditioned my dog to respond to a bell." -> I made my dog recognize and react to the sound of a bell "I conditioned my self to skip lunch" -> I made myself used to not having lunch "At work" after a noun refers to the continued influence of the noun (never used after the noun "working") "It was good to see my advice at work." -> It was good to see my advice being successful for the people I wanted to help.

来ます = 来 帰ります = 回来/回家 戻ります = 回来 Kaeru vs modoru is the more confusing distinction: Kaeru is used for 'returning home' You see "modoru" in games where you press "return" to return back to a previous menu or screen. You would use "modoru" over "kaeru" to return to work or school The phrase "Okaerinasai" is used when you see your family members returning home; a bit like when shop assistants say "irasshai(mase)" Also when you're in someone else's house and they want you to go away, they may use "kaeru" instead of "modoru", sort of saying "go home please". You probably also recognise 帰国 (return back to home country) which uses the onyomi form of the kanji for "kaeru"

って is the colloquial form of と Where と marks a phrase/sentence that you want to place verbal emphasis So that sentence would be something like "as you read some kind of book" or "I asked, what kind of book did you read?" But it's very context dependent.

I would use つまらない or つまんない instead of ひま. ひま describes free time for a person. これ、つまらないですよ。 If you want to make your expression a bit lighter you could also say 面白くない (not interesting; although Japanese people might also use 面白い to describe something that they don't like)