Some aldehydes also have common names, such as formaldehyde for methanal, acetaldehyde for ethanal. Benzaldehyde does not have a systematic form with -al.
The text explains that some aldehydes are known by common names like formaldehyde (for methanal) and acetaldehyde (for ethanal). However, benzaldehyde doesn't follow the standard naming convention of having "-al" at the end.