1. Apply = put into use
If you learn to apply the rules in Grammar, you will be able to write correctly.
2. Apply for = ask to be given
Have you applied for the post you were interested in?
3. Apply to = concern
The teacher's remarks did not apply to all students.
4. Apply something = put on a surface
You must apply this cream on dry skin.
5. Applied (adjective) = put into practical use
I have never passed an exam on applied mathematics.
6. Apply yourself to something / to doing something = give all your attention in order to succeed in doing something
She applied herself to cooking and soon became an excellent cook.
