Unique rules when forming that grammar are highlighted like this.
Example sentences follow these rules too!
Joining and Nesting Markers:
Verb[た/る] - means that dictionary form and ta form are accepted.
Verb[causative[て]] - means て form of the causative form of the verb.
ともあろう〜が follows a noun that denotes a person or group of people of high social standing, specialists, or simply someone that the speaker evaluates highly. It is followed by the speaker's opinion about that person's actual behavior, which differs from their expectations. It often expresses shock, reproach, or disappointment. However, it is sometimes also used for motivation (implying that the person in question is highly valued by the speaker) or to state in general what should be done by a person in such a position. Often seen alongside なんて, とは, のは and directly followed by expressions like 者, 人, 方.