In this section, we shall look at general rules. Some of the verb roots may not be studied before, but they will be studied as we move forward. Look at the general rules given below.

General rules for forming the doubled sounds:
Long vowels become short.

दा → ददा
dā → dadā

in this, the doubled sound should be noticed without taking too much effort.

Aspirated letters become unaspirated.

धा → दधा
dhā → dadhā

Two aspirated letters in a row cannot be pronounced, however, the first one can be left unaspirated.

Letters from kavarga shift to cavarga. h becomes j.

घुष् → जुघुष्
ghuṣ → jughuṣ
हु → जुहु
hu → juhu

This makes the resultant word easy to pronounce.

If the root begins with two consonants, the only one to appear is the first one. However, in case the first sound is s, and the second sound is invoiced, only second sound is pronounced. Look at the examples given below:

क्री → चिक्री
krī → cikrī

स्था → तस्था
sthā → tasthā

स्मृ → सस्मृ
smṛ → sasmṛ

e becomes and o become a

सेव् → सिषेव्
sev → siṣev
गै → जगै
gai → jagai

Because of this change, the doubled sound gets easier to produce.