Read each pattern and its example, then write your own sentence on the line.
〜というものだ N / V-dict / i-adj / na-adj + というものだ
States what something essentially is, presenting the speaker's judgment as an obvious truth. Often used for definitions, criticism or life lessons; sounds slightly declarative and written.
助け合うのが家族というものだ。 Helping each other is what a family is all about.
〜というものではない Plain form / N / na-adj + というものではない（でもない）
Denies that a general idea always holds true: 'it isn't simply the case that...'. Used to soften or correct an over-simple assumption; common in essays and careful speech.
お金があれば幸せになれるというものではない。 It's not simply the case that money makes you happy.
〜ないことはない V-nai / i-adj くない / na-adj でない + ことはない
A double negative meaning 'it's not that I can't / it's possible, though reluctantly'. Gives a cautious, hedged yes; common in polite spoken Japanese.
忙しいが、少しなら手伝えないことはない。 I'm busy, but it's not that I can't help a little.
〜に相違ない N / na-adj / plain form + に相違ない
Expresses the speaker's firm conviction: 'there is no doubt that'. A formal, written equivalent of 〜に違いない, seen in reports, legal texts and news.
この筆跡は本人のものに相違ない。 This handwriting is without a doubt his own.
〜ずにすむ V-nai stem + ずにすむ（する → せずにすむ）
Means you end up not having to do something unpleasant. Neutral register; 〜ないですむ is the more casual spoken form.
保険のおかげで、自分で払わずにすんだ。 Thanks to the insurance, I got by without paying out of pocket.
〜てばかりはいられない V-te + ばかりはいられない
Says you can't afford to go on doing only one thing, because something else needs doing. Carries a sense of pulling yourself together; used in speech and writing alike.
落ち込んでばかりはいられない。次を探そう。 I can't just keep moping. Let's look for the next one.