Don't and doesn't are contractions of "do not" and "does not." To figure out when to use each on, you have to know when to use do and does. The verb does is used when its subject is third person singular (he, she, it). Do is used for all other subjects. Below is a chart showing when to use each form:
|
|
singular |
plural |
|
first person |
I do |
We do |
|
second person |
You do |
You (all) do |
|
third person |
He does, She does, It does |
They do |
Don't and doesn't follow the same pattern:
|
|
singular |
plural |
|
first person |
I don't |
We don't |
|
second person |
You don't |
You (all) don't |
|
third person |
He doesn't, She doesn't, It doesn't |
They don't |
I hope this helps.