7.1.3 Subject-Complement Agreement
Subjects and complements should agree in number.
The child can take off his own shoes.
We asked trial participants to return their pill dispensers.
However, when the complement is shared by all constituents of the plural subject, it remains singular.
The authors were asked to revise their paper.
All study sites obtained approval from their institutional review board.
Investigators inserted a catheter into the study participants' pulmonary artery.