passive voice?


Hello I need help with the sentence below, rewording so it is not in passive voice

See example:

According to Cobb et al. (2010) the lasers most commonly used for periodontal treatment are diode lasers, Nd:YAG, Er:YAG, Er, Cr:YSGG, CO², and photodynamic therapy protocols.
asked Feb 09 '14 at 22:59 deannashannon New member

1 answer


Passive voice is not grammatically incorrect.  To make it active, you have to introduce a subject that is performing an action.  Dentists (subject) most commonly use these lasers for peridontal treatment. 


I've never studied this topic, so my observation might be off.  You indicate that you are going to list types of lasers.  Only the first one says laser.  I assume all of those initials are five more types of lasers.  Is a therapy protocol a laser, though?  If they are all lasers, then I think you should just say "diode" for the first one. 

As written: the lasers are A laser, B, C, D, and E.

Change to: the lasers are A, B, C, D, and E


If the therapy protocol isn't actually a laser, then you'll need to change the wording so that it isn't listed as one. 

Something like: the most common treatments are the A, B, C, D, and E lasers, and therapy protocol. 


You need a comma after your citation.  According to Cobb et al. (2010), the lasers ...

link comment answered Feb 09 '14 at 23:47 Patty T Grammarly Fellow

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