of action not performed in the past, [1495];

of action not performed at present time, [1497];

of past action going on, [1594];

of past action lasting while something occurs, [1595];

of repeated or customary action, [1596];

of past action still continued in past, [1597];

of action suddenly recognized, [1598];

in descriptions and general truths, [1599];

in letters and messages, [1601];

in conative use, [2302];