By Past perfect, Modals

Sharad, Sharad! You are getting yourself tangled up here! Let's see how we can get you untangled. He has had to live or die situations. He had had to live or die situations. He had have to live or die situations. None of these is exactly right. You want to include the idea of...

As far as I know, there are these 13 tenses: a) Past Perfect Progressive ........................had been + present participle b) Past Perfect ..........................................had + past participle c) Past Progressive ...................................was/were + present participle d)...