Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_2784232_1 ( arabic_form VARCHAR, morphological_category VARCHAR )

### Question ###
How many Arabic forms are there for the 1st. plur. perfect category?

### Accurate SQL ###

SELECT COUNT(arabic_form) FROM table_2784232_1 WHERE morphological_category = "1st. plur. perfect"