(Present) PRÄTERITUM
(Preterite/Past) PERFEKT
(Pres. Perfect) MÜSSEN - have to, must ich muss
I must, have to ich musste
I had to ich habe gemusst *
I had to du musst
you must, have to du musstest
you had to du hast gemusst *
you had to er/sie muss
he/she must er/sie musste
he/she had to er/sie hat gemusst *
he/she had to wir/Sie/sie müssen
we/you/they have to wir/Sie/sie mussten
we/you/they had to wir/Sie/sie haben gemusst *
we/you/they had to ihr müsst
you (pl.) must ihr musstet
you (pl.) had to ihr habt gemusst *
you (pl.) had to * In the present perfect or past perfect tense with another verb, the double infinitive construction is used, as in the following examples: ihr habt sprechen müssen = you (pl.) had to speak ich hatte sprechen müssen = I had had to speak Note: The old spelling with ß, as in ich muß or gemußt, is no longer used for forms of müssen. SOLLEN - should, ought to, supposed to ich soll
I should ich sollte
I should have ich habe gesollt *
I should have du sollst
you should du solltest
you should have du hast gesollt *
you should have er/sie soll
he/she should er/sie sollte
he/she should have er/sie hat gesollt *
he/she should have wir/Sie/sie sollen
we/you/they should wir/Sie/sie sollten
we/you/they should have wir/Sie/sie haben gesollt *
we/you/they should have ihr sollt
you (pl.) should ihr solltet
you (pl.) should have ihr habt gesollt *
you (pl.) should have * In the present perfect or past perfect tense with another verb, the double infinitive construction is used, as in the following examples: wir haben gehen sollen = we should have gone ich hatte fahren sollen = I had been supposed to drive WOLLEN - want to ich will
I want to ich wollte
I wanted to ich habe gewollt *
I wanted to du willst
you want to du wolltest
you wanted to du hast gewollt *
you wanted to er/sie will
he/she wants to er/sie wollte
he/she wanted to er/sie hat gewollt *
he/she wanted to wir/Sie/sie wollen
we/you/they want to wir/Sie/sie wollten
we/you/they wanted to wir/Sie/sie haben gewollt *
we/you/they wanted to ihr wollt
you (pl.) want to ihr wolltet
you (pl.) wanted to ihr habt gewollt *
you (pl.) wanted to * In the present perfect or past perfect tense with another verb, the double infinitive construction is used, as in the following examples: wir haben sprechen wollen = we wanted to speak ich hatte gehen wollen = I had wanted to go
From:https://www.dbfei.com/Article/deyu/201311/4885.html