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→ 
6.3. EXERCISES: THE ASPECT AND THE TIME FRAME
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→
6.1. LINGUISTIC GRAVITATION
There is a use in language we could compare to a natural phenomenon on Earth, namely gravitation. It can help us choose on the time frame and decide between the Perfect or Simple Aspects. More→
CHAPTER 6. WE CAN CHOOSE OUR PATHS ABOUT TIME
There are no universal principles for choosing between the Present Perfect and the Past Simple. We may learn many classic rules, yet the truth is going to be that we need own resolves in context. An idea as a time frame can help. More→
