For all tenses, this is always the first element in the verb pattern to change with the time extent (PRESENT, PAST, or FUTURE). It changes the same in our Fields of Time. We can say that it is the form closest to our cognitive ground. It changes the same for our value ON.
Grammar exercises can "buy" us some luck at tests and exams — here we have some more of our grammar "good luck boutique", and good American does not have to be grave serious. More→
Mind practice for the Aspect and the time frame.
2. The skylark found nothing to outbid the bit of cosmos with a squid.
8. The spotted redshank bachelorette did reset her buret for the bouncing bet. More→
Written or spoken texts do not determine our inner language. We can learn to focus on the Aspect, gather our verb forms from elements, as well as take language tasks "at the drop of the hat", when our inner language integrates the essentials.
We recognize Aspect patterns for the Simple, Progressive, and Perfect, from uses for the PRESENT, PAST, and FUTURE. In simple words, we draw conclusions on the River of Time running through the Fields of Time.
We exercise verb 1st and 2nd forms for the grammatical PRESENT, PAST, and FUTURE. In simple words, we learn to put verbs in Fields of Time.