I am really having problems with the personal A. For example, Yo quiero conocer a hablantes de ingles
Here are some tips:
It's only with people and animals
Some verbs like tener y haber don't use it e.g. Tengo una hermana.
If the person isn't a specificed person you don't need to use it e.g. necesito jardinero (refers to any garderner)
Generally though if the object is a person or animal it needs to be used.
Veo un libro (no 'a' as a book isn't a person or animal)
Veo a una chica.
Con a y sin a.
Usamos la a personal para OD de personas, pero cuando es peraona o personas indeterminadas podenos suprimirla.
busco a un profesor...uno concreto
busco un profesor. ...indeterminado
* I meant to say 'hay'
You don't use it with this one e.g. hay dos chicas aqui
"Yo quiero conocer hablantes de Inglés."
Without the a.