What _zullen_ (to 'will') and _kunnen_ (to be able, can) have in common is that they share the same irregular vowel change in the 1st and 3rd person of the [present tense.](#/lesson/Verbs.Re07)
_Zullen_ is the auxiliary verb we use for the [future tense](#/lesson/Verbs.Re17).
Zullen (will)
Simple present:
ik | zal | we | zullen
je | zal/zult\* | jullie | zullen
hij | zal | ze | zullen
Simple past:
ik | zou | we | zouden
je | zou | jullie | zouden
hij | zou | ze | zouden
Past participle: gezuld\\
(\*) Je _zult_ and je _zal_ are both correct.
(\\) You will rarely come across the past participle 'gezuld'. Zullen is used as an auxiliary verb for the future tense. This means it always precedes (supports) another verb. When a [past participle acts as an auxiliary for another verb, it turns into an infinitive](#/lesson/Verbs.Au05).
Note the similarities between _zullen_ and _kunnen:_
Kunnen (can)
Simple present:
ik | kan | we | kunnen
je | kan/kunt\* | jullie | kunnen
hij | kan | ze | kunnen
Simple past:
ik | kon | we | konden
je | kon | jullie | konden
hij | kon | ze | konden
Past participle: gekund
(\*) Je _kunt_ and je _kan_ are both correct.
Note that the examples above give you the unstressed [personal pronouns](#/lesson/Pronouns.Ps01). Some pronouns change when they are stressed in a phrase: je/jij, we/wij, ze/zij (both singular and plural).