Okay, at the last meeting there was a desire to see some 'quick and dirty' explanations of the various verb tenses (in English) and how they are used/what differentiates them. A very quick poke at Google has yielded the following:
TYPES OF VERBS
The menu on the left of the page lists the various tenses. Clicking
provides information about how a tense is used and examples. Thorough,
but not the handiest cheat sheet type tool.
THE 12 VERB TENSES - USAGE
Quick and dirty graphic
THE BASIC FORMS OF THE ENGLISH VERB TENSES
Quick chart with constructions and examples.
ENGLISH VERB TENSES
Page with links. More detail, more clicking/navigating back and forth.
Hope this helps. If not, there is a tanker truck load more to be had by
searching Google for "all about verb tenses".