Gweithgaredd 37

In this example, the preposition i has conjugated, iddo.  There is a soft mutation after some/most prepositions and conjugated prepositions, e.g.

Aeth Efan i'r gwely ar ôl iddo gyrraedd adref.

Mae'n flin ganddo gyhoeddi'r newyddion trist.

The suffixes (endings) for the prepositions can be found by clicking here.

The table of mutations can be found by clicking here.

uchel is an irregular adjective.   When using uchel in a comparative context, we use uwch.  Here are some irregular adjectives:

Absolute	Equative as … as	Comparative e.g. better	Superlative e.g. best
da	cystal	gwell	gorau
drwg	cynddrwg	gwaeth	gwaethaf
mawr	cymaint	mwy	mwyaf
bach	cyn lleied / mor fach	llai	lleiaf
isel	mor isel	is	isaf
uchel	cyfuwch / mor uchel	uwch	uchaf

The subject/person completing the action is not indicated in an impersonal verb's suffix (ending). 

-ir, -wyd and -id are the most commonly used suffixes for impersonal verb forms.  

The impersonal verb forms can be shown as follows:

-ir	Gwelir	Present Tense	Gwelir clychau'r gog bob mis Mai.
-wyd	Gwelwyd	Past Tense	Gwelwyd eira yn ystod y gaeaf llynedd.
-id	Gwelid	Imperfect Tense	Gwelid gwiwerod coch mewn coedwigoedd ers talwm.

When using concise forms of the verb, the normal sentence structure in Welsh is Verb + Subject + Object, e.g.
Rhedodd y ferch y ras.
Ysgrifennodd y bardd gerdd.
Dylai'r plant gael gwersi.

However, sentences which include impersonal verbs do not follow this pattern. 

When using the impersonal tense, the object follows the verb and the subject/person completing the action is included after gan, e.g.
Rhedwyd ras gan y ferch.
Ysgrifennwyd y gerdd gan y bardd.
Cafwyd amser da gan bawb.

Note also that there is no soft mutation after an impersonal verb (unlike personal verbs), e.g.
Ysgrifennwyd cerdd gan y bardd.
Ysgrifennodd y bardd gerdd.

dylai (he/she/it should) this is a defective or incomplete verb and doesn't have the full range of tenses:

Positive	Negative
Dylwn i	Ddylwn i ddim
Dylet ti	Ddylet ti ddim
Dylai  e/o	Ddylai e/o ddim
Dylai  hi	Ddylai hi ddim
Dylen  ni	Ddylen ni ddim
Dylech chi	Ddylech chi ddim
Dylen  nhw	Ddylen nhw ddim

When using the negative forms, the d takes a soft mutation and is replaced with a dd and ddim is also added, e.g.
Ddylwn i ddim aros yn rhy hir.

Welais i mohoni - Ddim / mo / mo'r
When the object is indefinite (e.g. a film, a book etc.), use ddim, e.g.
Welais i ddim ffilm neithiwr. (I didn't see a film last night.)

When the object is definite (e.g. the film, the book), use mo'r, e.g.
Welais i mo'r ffilm neithiwr. (I didn't see the film last night.)

When the object is named (e.g. Star Wars, War and Peace), use mo, e.g.
Welais i mo Star Wars neithiwr. (I didn't see Star Wars last night.)

When the definite object is a pronoun (he, she, them …), i.e. a word used to replace a noun that has already been mentioned, the preposition o conjugates as follows in a negative context:

mohono i	Welaist ti mohono i	You didn't see me
mohonot ti	Welais i mohonot ti	I didn't see you
mohono fe/fo	Welais i mohono fe/fo	I didn't see him
mohoni hi	Welodd e mohoni hi	He didn't see her
mohonon ni	Welsoch chi mohonon ni	You didn't see us
mohonoch chi	Welodd hi mohonoch chi	She didn't see you
mohonyn nhw	Welais i mohonyn nhw	I didn't see them

The endings for the short form of the imperfect tense are as follows.

Person	Unigol	Lluosog
1	-wn	-em
2	-et/-it	-ech
3	-ai	-ent

In this case, the first person singular ending is required, e.g.

gallwn i, cofiwn i, cerddwn i

Gwneud is an irregular verb and it is conjugated as follows:

Gwneud

Gwnawn i

Gwnait/Gwnaet ti

Gwnâi hi

Gwnaem ni

Gwnaech chi

Gwnaent hwy

Gwnâi e/o

Remember

There is a soft mutation at the start of the negative form, e.g.

ni allwn i, allet ti ddim, ni wnaem ni

The table of mutations can be found by clicking here.