The pattern from lesson 8 still applies: remove -en to find the stem; use the stem with ik, stem + t with jij / hij / zij (she) / u, and the infinitive with wij / jullie / zij (they). The new point is spelling: some stems need a small change.
Take wonen (to live). You hear a long oo sound. In wo-nen, the first syllable ends in a vowel, so this long sound is written with one letter: o. In the stem woon, the syllable ends in a consonant. To keep the vowel sound long, write two letters: oo. Then use the familiar forms: ik woon, jij woont, hij woont, wij wonen. The vowel sound stays the same; only the spelling changes.
The same applies to a and e: slapen → slaap (ik slaap, jij slaapt, wij slapen), betalen → betaal (ik betaal, u betaalt, wij betalen), and nemen → neem (ik neem, hij neemt, jullie nemen). Two more examples from lesson 12 are kopen → koop and koken → kook.
In koop, kook, betaal and neem, the long vowel is written with two identical letters: oo, aa or ee. In werk and drink, the vowel is short, so you do not double it. In luister, the ui spelling stays unchanged. Dutch vowel spelling follows different rules from English, so listen carefully to the audio.
Today we practise wonen (to live), slapen (to sleep), kopen (to buy), koken (to cook), betalen (to pay) and nemen (to take). We also revise drinken (to drink), whose stem needs no spelling change.
The verb pattern from lesson 8 stays the same. For the verbs with a long a, e or o sound in this lesson, double that vowel in the stem: koop, kook, betaal, neem. For example, the three forms of kopen are koop, koopt, kopen.