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Means 'it's not as if ...', giving a reason to criticize or reassure. Carries a scolding or exasperated tone; spoken, and rather blunt with superiors.
N + ではあるまいし（じゃあるまいし）／ plain form + の + ではあるまいし
〜ではあるまいし
Says a result is fitting given the effort, training or reputation behind it: 'it lives up to it, no wonder'. Praising tone; often paired with さすが.
N / V-dict / V-ta / i-adj / na-adj な + だけのことはある
〜だけのことはある
Asserts emphatically that something is precisely this and nothing else. Formal and written; common in editorials, speeches and academic prose.
N + にほかならない（理由なら plain form + からにほかならない）
〜にほかならない
Declares firm determination to accomplish something, often to prove it to others; can also mean demonstrating an action. Emphatic and spoken.
V-te + みせる
〜てみせる
Means 'now that ... , naturally the following must happen'. Introduces a resolve or obligation that follows from a decided fact; formal and written.
V-dict / V-ta + 上は
〜上は
Means something has enough value to deserve the action: 'is worth, merits'. Formal and written; typical in reviews, reports and evaluations.
N / V-dict + に値する
〜に値する
Means the action is unnecessary because the matter is obvious or trivial. Slightly formal; 言うまでもない ('needless to say') is a set phrase.
V-dict + までもない
〜までもない
Marks doing something for a junior, a child, an animal or a plant; with volitional force it shows defiant determination ('just watch me'). Casual and male-leaning.
V-te + やる
〜てやる
Picks up a word just mentioned and develops it: 'speaking of ...'. Used to introduce a typical association or to change topic naturally; neutral register.
N / plain form + と言えば
〜と言えば
〜に決まっている Expresses the speaker's strong certainty: 'it's bound to be, obviously'. Casual and subjective, common in conversation; too blunt for formal writing. — N / na-adj / plain form + に決まっている
〜ほどのことはない Says a matter isn't serious enough to warrant that action: 'it's not worth doing, no need to go that far'. Reassuring tone; used in speech and writing. — V-dict + ほどのことはない
〜にすぎない Plays something down as merely or no more than that. Slightly formal and often modest or dismissive; frequent in news and written arguments. — N / plain form + にすぎない
〜ものがある Says that something has a certain quality the speaker senses strongly: 'there is something ... about it'. Slightly literary; common in reviews and commentary. — V-dict / i-adj / na-adj な + ものがある
〜なりに Means 'in one's own way, within one's own limits'. Acknowledges limited ability or standing while praising the effort; neutral, slightly polite. — N / plain form + なりに（名詞修飾は なりの）
〜ものだろうか Voices doubt that something is really so, or, with ない, a wish that it could be. Reflective and slightly literary; common in essays and monologue. — V-dict / V-nai / i-adj / na-adj な + ものだろうか
〜というより Rejects one description in favor of a more accurate one: 'rather than ..., it's more like ...'. Neutral and very common in both speech and writing. — Plain form / N / na-adj + というより（むしろ）
〜とは限らない Denies that something is always true: 'not necessarily'. Used to counter a generalization; neutral register, very common in essays and discussion. — Plain form / N + とは限らない
〜たものだ Recalls what someone often used to do in the past, with a nostalgic tone. Typically spoken by an older speaker looking back; not for one-off past events. — V-ta + ものだ（よく〜たものだ）