Assertion: auxiliary verb's form | /r/ObjectUse | used in informal english
Facets:
value: very frequently
type: DEGREE
value: commonly
type: DEGREE
Source sentences:
text: Most of the modals have contracted negated forms in n't which are commonly used in informal English: can't, mustn't, won't (from will), etc.
text: Such forms are used very frequently in informal English.