Sentence examples for this is an extra from inspiring English sources
"This is an extra service.
"This is an extra cost which will lower profits for the business.
In most cases this is an extra payment on top of the £200,000 you would receive if you later developed another serious illness.
This is an extra precaution because even sophisticated navigation gyros must work harder to pinpoint a plane's location near the pole, as longitude and latitude lines converge and all directions become south.
The bad news is that this is an extra 40 minutes - meaning that journeys which took three and a half hours ten years ago will be taking four and a half hours in year 7 of this Labour Government.
This is an extra-notable No, 1. From Gary Trust's Billboard piece: " 'Shake' becomes just the 21st song (of 1,023 No. 1s dating to the chart's 1958 launch) to debut at No. 1 on the Hot 100.
Book in translation Mend the Living by Maylis de Kerangal, trans Jessica Moore (MacLehose) The story of a heart transplant told over a single day, this is an extra-ordinary novel about life, death and the zone in between from a rising French author.
"They smell like cookies," she said, as if this were an extra selling point.
Could this be an extra revenue stream?
This was an extra step that allowed people to then use nicknames (handy for celebrities with pseudonyms) and still appear highly in search results.
