第一個(gè)句子主句是A data breach occurs,后面的是時(shí)間狀語(yǔ)從句,are supposed to是從句的謂語(yǔ).
2.whom to notify internally and externally和how customers will be alerted and a public relations plan是兩個(gè)賓語(yǔ),其實(shí)是兩個(gè)問(wèn)題變成了陳述句語(yǔ)序,變成了賓語(yǔ)的兩個(gè)部分,應(yīng)該是this includes whom and how,to notify internally and externally是用來(lái)修飾whom的,customers will be alerted and a public relations plan是修飾how的