Spanish · Chapter 7 · Lesson 2 · Grammar primer
Conjugating ar verbs present
Prescribed by the AQA specification.
The short version
The boot: why pienso but pensamos
Stem-changing -ar verbs keep the regular endings and mutate the stressed vowel in yo, tú, él and ellos only, because those are the forms where the stress lands on the stem. Nosotros and vosotros keep the original vowel. Three patterns cover the top thousand, and jugar is the only verb in Spanish that does u to ue.
juego
That's the gist. The full article goes deeper - more examples, the edge cases, the why - and the practice below scores like a vocabulary session and earns the same XP.
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22-question session
One question at a time, mixed across the exercises in this lesson. Miss one and it comes back round before the end.
Lesson 2 of 11 in this chapter