 
Languages of this type involve changes in grammatical category marking in negative sentences (Miestamo 2008). For example, in Koyraboro Senni Songhay, the imperfective marker in the affirmative is replaced by a suppletive ‘negative imperfective’ marker in negative sentences.<br><br>

a. 	n 	<b>ga</b> 	koy 		  <br>
	2sg.subj 	impf 	go 	<br>	
‘You ( sg ) are going.’ 	 	<br> <br>

b. 	war<b>  	si </b>	koy <br>
2pl.subj 	neg.impf 	go  <br>
‘You ( pl ) are not going.’ <br> <br>

It should also be noted that according to Miestamo (2008), English exhibits negative asymmetry in category, since the negative versions of affirmative sentences without auxiliaries induce the introduction of a dummy auxiliary <i>do</i>. <br><br>

<b>Note:</b> Many languages have several types of asymmetric negation. Such languages will be marked <b>yes</b> or <b>no</b> for each relevant property. Languages which <b>do not have asymmetric negation</b> will be marked <b>N/A</b>. 

<br><br><b>References</b><br>
Miestamo, Matti. 2008. Subtypes of Asymmetric Negation.
In Haspelmath et al. (2008), chapter 114. Available online at <a href=â€http://wals.info/feature/114â€> http://wals.info/feature/114</a href>. Accessed 2008-11-14. 
