How do i write three sentence using plurals correctly and three sentences using possessives correctly on the topic of how to store personal financial information effectively and efficiently.

2 answers

Write a sentence on your given topic using each of the following:

Plurals --

credit cards
bank accounts
computer files

Possessives --

file's
my
bank's

Remember that plurals are indicating more than one of something. Possessives are indicating ownership; they must be immediately followed by whatever the possessive owns. Example: That is my brother's bank account.
Start with writing your six sentences.

Then go back and figure out where to put possessives and plurals if you haven't already used them.