Invoices 究竟係咪 用 have?

究竟Delivery Notes / Invoices 用 have 定 has ?
Plural所以用 have

如果Delivery Note / Invoice 就用has ,唔止一張就用have??
正確

Delivery Notes / Invoices 用 have - because notes / invoices are plural

Delivery Note / Invoice 就用has ,- correct because note /invoice is singular

用 have 定 has ? depends on the subject(主詞)

Mary has settled all invoices. (主詞 Mary )

all invoices have been settled.(主詞 invoices )