Hello my dear
If we are talking about the most common prepositions, pronouns and special weak forms.
We can start by describing the kinds of pronouns:
Personal pronouns /Adjective pronouns/ Possessive adjectives/Reflexive pronouns
I/you/he/she/it/ &nb sp; My/your/his/her/its Mine/yours/his/hers myself/yourself/
you/we/they your(plural)/our/their yours/ours/theirs himself /herself
& nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; itself/yourselves
&nbs p; &nbs p; &nbs p; &nbs p; &nbs p; &nbs p; &nbs p; &nbs p; ourselves/ themselves
Regarding to weak forms, they are used in rapid speech, because if you want to mention some word in isolation; you will have to use the strong form.
I hope this will be worth for you