Certain adjectives, although modifying the noun within a sentence, in effect modify the verb as well.
- He was the first to arrive: prīmus vēnit.
- I in no way doubt: nūlla dubitō.
- They were glad to hear: laetae audiērunt.
- He was often at Rome: Rōmae frequēns erat.
- She arrived late: sēra vēnit.
The Essential AG: 290
Latin for Addicts 
Quod ad praescriptionem articuli pertinet, acta cum exemplis tuis et descripta esse demonstretur, equidem primum, tertium quintumque non adiectiva subiectorum, sed praedicativa exponere puto.
Scilicet, non “adiectiva subiectorum”, sed “adverbia” scripsissem. Si vis, Ryan, emenda responsionem meam primam.