These drills help students to tell apart these six —
Notice that (1) and (2) mean the same thing, and so do (3) and (4).
These drills show sentences such as, for instance,
When should I stop?
When you get so many greens in a row that you get bored, or after four minutes, whatever happens first.
What is the SWAP button for?
It shuffles the words of the sentence. That does not change its meaning, but sometimes makes it easier to understand. Swap as much as you like before or after guessing.
The translations that appear in your buttons sometimes suck.
That's because, very deliberately, I am teaching you Sanskrit, not English. You are supposed to improve on them yourself. Please see hints to get better English translations.