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Croeseiriau Cymraeg Part 4.3 (Crossword 4.4) - Dylwn i - I should

  • In this section we discuss the modal verb - should.  A modal verb is an auxiliary or helper verb that expresses possibility or necessity. In the English language modal verbs include must , shall , will , should , would , can , could , may  and  might . Welsh 'verbs' gallwn - could , byddwn - would and hoffwn - would like , all employ similar endings to dylwn .


    Dylwn i
    is not followed by “yn + verb noun” but only the verb noun. It also causes a mutation in the verb that follows (see examples below).

    Dylwn i orffen fy ngwaith yn gyntaf . - I should finish my work first.

    Dylech chi aros yn y heddiw . - You should stay in the house today.

    To say 'I should have', 'you should have' etc put fod wedi after dylwn . The following verb does not mutate. See full forms below.


    dylwn i                                               i should/ i ought to
    dylet ti (familiar)                                 you should/ you ought to
    dylai fe                                               he should/ he ought to
    dylai hi                                               she should/ she ought to
    dylen ni                                              we should/ we ought to
    dylech chi (plural,formal)                   you should/ you ought to
    dylen nhw                                          they should/ they ought to 


    ddylwn i ddim                                        i shouldn’t
    ddylet ti ddim (familiar)                         you shouldn’t
    ddylai fe ddim                                       he shouldn't
    ddylai hi ddim                                       she shouldn’t
    ddylen ni ddim                                      we shouldn’t
    ddylech chi ddim (plural,formal)           you shouldn’t
    ddylen nhw ddim                                  they shouldn’t


    ddylwn i?                                             should I?
    ddylet ti? (familiar)                               should you?
    ddylai fe?                                             should he?
    ddylai hi?                                             should she?
    ddylen ni?                                            should we?
    ddylech chi? (plural,formal)                 should you?
    ddylen nhw?                                        should they?


    Dylet/na ddylet, Dylech/Na ddylech
    Dylwn/na ddylwn
    Dylai/Na ddylai
    Dylai/Na ddylai
    Dylech/Na ddylech, Dylen/Na ddylen
    Dylwn/na ddylwn, Dylen/Na ddylen
    Dylen/Na ddylen


    dylwn i fod wedi                    i should have                        
    dylet ti fod wedi                     you (familiar) should have              
    dylai hi fod wedi                    she should have             
    dylai e/o/fe fod wedi              he should have
    dylen ni fod wedi                   we should have           
    dylech chi fod wedi               you (formal & plural) should have        
    dylen nhw fod wedi               they should have