Not only...but also

Not only...but also.

To use this correlative conjunction properly, make sure the “but also” part is adding to and reinforcing the “not only” part.

Do not use this particular conjunction to highlight a difference or link a negative with a positive.

Here are three examples of how NOT to do it:

Not only does the crop generate enormous profits for producers and food companies, but it also leads to enormous public health problems. 

(An apparent positive is tied inappropriately to a negative).

Not only did she attend the meeting, but also she left early.
(Incorrect because "left early" is not reinforcing "attended the meeting," but rather contrasting it).

Not only is he not a good listener, but also he's a great friend.
(The second clause does not reinforce the negative aspect of the first clause. Instead, it presents a positive quality.)

Now, here are three examples of proper usage of "not only... but also":

Reinforcing a positive: Not only is she intelligent, but also she's incredibly kind and compassionate.
Both clauses highlight positive qualities, reinforcing each other.


Reinforcing a negative: Not only did he fail to complete the project on time, but also he didn't even bother to apologize.
Both clauses emphasize negative actions, strengthening the overall negative impact.


Adding a surprising or unexpected detail: Not only is she a talented musician, but also she's a skilled mathematician.
The second clause adds an unexpected dimension to the first, making the sentence more interesting.