Having relied on ill-remembered Latin lessons to remember my tenses for too long, a few years ago I bought a book on English grammar: the Oxford Everyday Grammar.
Regarding tenses, the book stated that English had but two:
present and
past. It turns out they are talking about modification of the verb word, which may or may not be relevant to them, but less so for the rest of us. (There would, to use a verb discussed in the last few weeks, be I pass and I pass
ed.)
However, edging into the real world, they identified twelve active (yes 12) 'tenses', as follows.
Present:
-
Simple: I pass (10)
-
Continuous: I am passing (5)
-
Perfect: I have passed (2)
-
Perfect Continuous: I have been passing (1)
Past:
-
Simple: I passed (3)
-
Continuous: I was passing (2)
-
Perfect: I had passed (3)
-
Perfect Continuous: I had been passing (2)
Future:
-
Simple: I shall pass (2)
-
Continuous: I shall be passing (1)
-
Perfect: I shall have passed (1)
-
Perfect Continuous: I shall have been passing (1)
I won't bore everyone with the twelve passive forms, save to say that the book's example of the passive future perfect continuous is (and take a deep breath):
I shall have been being bitten, and if that doesn't drive one to be twice shy, I don't know what will.
Oh, and the numbers in brackets? Those are the number of different ways in which each form can be used, according to the book! So there's little chance of any of us stumbling over our tenses in future; we'll all be perfect, if not passive.