List problem

[subhabangalore at gmail.com]

Dear Group,

I have a list of the following pattern,

[("''", "''"), ('Eastern', 'NNP'), ('Army', 'NNP'), ('Commander', 'NNP'), ('Lt', 'NNP'), ('Gen', 'NNP'), ('Dalbir', 'NNP'), ('Singh', 'NNP'), ('Suhag', 'NNP'), ('briefed', 'VBD'), ('the', 'DT'), ('Army', 'NNP'), ('chief', 'NN'), ('on', 'IN'), ('the', 'DT'), ('operational', 'JJ'), ('preparedness', 'NN'), ('and', 'CC'), ('the', 'DT'), ('security', 'NN'), ('scenario', 'NN'), ('in', 'IN'), ('the', 'DT'), ('eastern', 'NN'), ('region', 'NN'), (',', ','), ("''", "''"), ('defence', 'NN'), ('spokesperson', 'NN'), ('Group', 'NNP'), ('Capt', 'NNP'), ('T', 'NNP'), ('K', 'NNP'), ('Singha', 'NNP'), ('said', 'VBD'), ('here', 'RB')]

Now, as we see it has multiple VBD elements.
I want to recognize,count and index them all.

If any one can kindly suggest.

Regards,
Subhabrata