Helping verbs in English language are: be, am, is, are, was, were, been, has, have, had, do, did, does; shall, should, will, would, may, might, must, can and could. Helping verbs or auxiliary verbs are used along with the main verb to describe the past or present or future.

Note the conjugation or the forms of the three main helping verbs ‘be, do, have’: TO BE: to be, am, is, are, was, were, and been; TO HAVE: have, has, and had; TO DO: do, does, did. These three verbs (to be, to do, to have) can function as the main verb or as helping verbs in a sentence. 

Modal auxiliary verbs or modal helping verbs are the verbs that do not change their form, and they are: will, would, shall, should, can, could; may, might; must, and ought to.

The helping verbs help the main verb in describing an action or a state in a ‘particular aspect of time’ that is the action or the inaction of the present, past or future.

In Swedish language, the helping verbs are:

  1. Har / hade = has / have / had
  2. Vill / ville = to want to / will  
  3. Behöver / behövde = to need to
  4. Ska / skulle = shall / should
  5. Kan / kunde = can / could, be able to
  6. Får / fick = to be allowed to, expresses permission or allowance (has many meanings)
  7. Brukar / brukade = usually / used to
  8. Måste = have to / must
  9. Bör/ borde = ought to
  10. Börjar /började = start, commence

The helping verbs and their multiple forms or conjugations based on particular aspect of time:  

  Infinitiv Imperativ Presens Preterirum Supinum
OUGHT TO Att böra . . . Bör Borde Bort
MAY Att få Får Fick Fått
HAVE Att ha / Hava Ha Har Hade Haft
CAN Att kunna . . .  Kan Kunde Kunnat
WILL, SHALL Att skola . . . Ska (skall) Skulle Skolat
WILL, WANT Att vilja . . . Vill Ville Velat
MUST Måste . . . Måste Måste Måst
NEED  Att behöva Behöv Behöver Behövde Behövt
USED TO Att bruka Bruka Brukar Brukarde Brukart
 START Att börja Börja Börjar Började Börjat